Justice KAGAN delivered the opinion of the Court.

The Armed Career Criminal Act (ACCA or Act), 18 U.S.C. § 924(e), imposes a 15-year mandatory minimum sentence on certain federal defendants who have three prior convictions for a "violent felony," including "burglary, arson, or extortion." To determine whether a past conviction is for one of those offenses, courts compare the elements of the crime of conviction with the elements of the "generic" version of the listed offense — i.e., the offense as commonly understood. For more than 25 years, our decisions have held that the prior crime qualifies as an ACCA predicate if, but only if, its elements are the same as, or narrower than, those of the generic offense. The question in this case is whether ACCA makes an exception to that rule when a defendant is convicted under a statute that lists multiple, alternative means of satisfying one (or more) of its elements. We decline to find such an exception.

I

A

ACCA prescribes a 15-year mandatory minimum sentence if a defendant is convicted of being a felon in possession of a firearm following three prior convictions for a "violent felony." § 924(e)(1). (Absent that sentence enhancement, the felon-in-possession statute sets a 10-year maximum penalty. See § 924(a)(2).) ACCA defines the term "violent felony" to include any felony, whether state or federal, that "is burglary, arson, or extortion." § 924(e)(2)(B)(ii). In listing those crimes, we have held, Congress referred only to their usual or (in our terminology) generic versions — not to all variants of the offenses. See Taylor v. United States, 495 U.S. 575, 598, 110 S.Ct. 2143, 109 L.Ed.2d 607 (1990). That means as to burglary — the offense relevant in this case — that Congress meant a crime "contain[ing] the following elements: an unlawful or unprivileged entry into ... a building or other structure, with intent to commit a crime." Ibid.

To determine whether a prior conviction is for generic burglary (or other listed crime) courts apply what is known as the categorical approach: They focus solely on whether the elements of the crime of conviction sufficiently match the elements of generic burglary, while ignoring the particular facts of the case. See id., at 600-601, 110 S.Ct. 2143. Distinguishing between elements and facts is therefore central to ACCA's operation. "Elements" are the "constituent parts" of a crime's legal definition — the things the "prosecution must prove to sustain a conviction." Black's Law Dictionary 634 (10th ed. 2014). At a trial, they are what the jury must find beyond a reasonable doubt to convict the defendant, see Richardson v. United States, 526 U.S. 813, 817, 119 S.Ct. 1707, 143 L.Ed.2d 985 (1999); and at a plea hearing, they are what the defendant necessarily admits when he pleads guilty, see McCarthy v. United States, 394 U.S. 459, 466, 89 S.Ct. 1166, 22 L.Ed.2d 418 (1969). Facts, by contrast, are mere real-world things — extraneous to the crime's legal requirements. (We have sometimes called them "brute facts" when distinguishing them from elements. Richardson, 526 U.S., at 817, 119 S.Ct. 1707.) They are "circumstance[s]" or "event[s]" having no "legal effect [or] consequence": In particular, they need neither be found by a jury nor admitted by a defendant. Black's Law Dictionary 709. And ACCA, as we have always understood it, cares not a whit about them. See, e.g., Taylor, 495 U.S., at 599-602, 110 S.Ct. 2143. A crime counts as "burglary" under the Act if its elements are the same as, or narrower than, those of the generic offense. But if the crime of conviction covers any more conduct than the generic offense, then it is not an ACCA "burglary" — even if the defendant's actual conduct (i.e., the facts of the crime) fits within the generic offense's boundaries.

The comparison of elements that the categorical approach requires is straightforward when a statute sets out a single (or "indivisible") set of elements to define a single crime. The court then lines up that crime's elements alongside those of the generic offense and sees if they match. So, for example, this Court found that a California statute swept more broadly than generic burglary because it criminalized entering a location (even if lawfully) with the intent to steal, and thus encompassed mere shoplifting. See id., at 591, 110 S.Ct. 2143; Descamps v. United States, 570 U.S. ___, ___ _ ___, 133 S.Ct. 2276, 2283-2284, 186 L.Ed.2d 438 (2013). Accordingly, no conviction under that law could count as an ACCA predicate, even if the defendant in fact made an illegal entry and so committed burglary in its generic form. See id., at ___ _ ___, 133 S.Ct., at 2292-2293.

Some statutes, however, have a more complicated (sometimes called "divisible") structure, making the comparison of elements harder. Id., at ___, 133 S.Ct., at 2283. A single statute may list elements in the alternative, and thereby define multiple crimes. Suppose, for example, that the California law noted above had prohibited "the lawful entry or the unlawful entry" of a premises with intent to steal, so as to create two different offenses, one more serious than the other. If the defendant were convicted of the offense with unlawful entry as an element, then his crime of conviction would match generic burglary and count as an ACCA predicate; but, conversely, the conviction would not qualify if it were for the offense with lawful entry as an element. A sentencing court thus requires a way of figuring out which of the alternative elements listed — lawful entry or unlawful entry — was integral to the defendant's conviction (that is, which was necessarily found or admitted). See id., at ___, 133 S.Ct., at 2283. To address that need, this Court approved the "modified categorical approach" for use with statutes having multiple alternative elements. See, e.g., Shepard v. United States, 544 U.S. 13, 26, 125 S.Ct. 1254, 161 L.Ed.2d 205 (2005). Under that approach, a sentencing court looks to a limited class of documents (for example, the indictment, jury instructions, or plea agreement and colloquy) to determine what crime, with what elements, a defendant was convicted of. See ibid.; Taylor, 495 U.S., at 602, 110 S.Ct. 2143. The court can then compare that crime, as the categorical approach commands, with the relevant generic offense.

This case concerns a different kind of alternatively phrased law: not one that lists multiple elements disjunctively, but instead one that enumerates various factual means of committing a single element. See generally Schad v. Arizona, 501 U.S. 624, 636, 111 S.Ct. 2491, 115 L.Ed.2d 555 (1991) (plurality opinion) ("[L]egislatures frequently enumerate alternative means of committing a crime without intending to define separate elements or separate crimes"). To use a hypothetical adapted from two of our prior decisions, suppose a statute requires use of a "deadly weapon" as an element of a crime and further provides that the use of a "knife, gun, bat, or similar weapon" would all qualify. See Descamps, 570 U.S., at ___, 133 S.Ct., at 2289; Richardson, 526 U.S., at 817, 119 S.Ct. 1707. Because that kind of list merely specifies diverse means of satisfying a single element of a single crime — or otherwise said, spells out various factual ways of committing some component of the offense — a jury need not find (or a defendant admit) any particular item: A jury could convict even if some jurors "conclude[d] that the defendant used a knife" while others "conclude[d] he used a gun," so long as all agreed that the defendant used a "deadly weapon." Ibid.; see Descamps, 570 U.S., at ___, 133 S.Ct., at 2288 (describing means, for this reason, as "legally extraneous circumstances"). And similarly, to bring the discussion back to burglary, a statute might — indeed, as soon discussed, Iowa's burglary law does — itemize the various places that crime could occur as disjunctive factual scenarios rather than separate elements, so that a jury need not make any specific findings (or a defendant admissions) on that score.

The issue before us is whether ACCA treats this kind of statute as it does all others, imposing a sentence enhancement only if the state crime's elements correspond to those of a generic offense — or instead whether the Act makes an exception for such a law, so that a sentence can be enhanced when one of the statute's specified means creates a match with the generic offense, even though the broader element would not.

B

Petitioner Richard Mathis pleaded guilty to being a felon in possession of a firearm. See § 922(g). At sentencing, the Government asked the District Court to impose ACCA's 15-year minimum penalty based on Mathis's five prior convictions for burglary under Iowa law.

Iowa's burglary statute, all parties agree, covers more conduct than generic burglary does. See Brief for Petitioner 36; Brief for United States 44. The generic offense requires unlawful entry into a "building or other structure." Taylor, 495 U.S., at 598, 110 S.Ct. 2143; supra, at 2248. Iowa's statute, by contrast, reaches a broader range of places: "any building, structure, [or] land, water, or air vehicle." Iowa Code § 702.12 (2013) (emphasis added). And those listed locations are not alternative elements, going toward the creation of separate crimes. To the contrary, they lay out alternative ways of satisfying a single locational element, as the Iowa Supreme Court has held: Each of the terms serves as an "alternative method of committing [the] single crime" of burglary, so that a jury need not agree on which of the locations was actually involved. State v. Duncan, 312 N.W.2d 519, 523 (Iowa 1981); see State v. Rooney, 862 N.W.2d 367, 376 (Iowa 2015) (discussing the single "broadly phrased ... element of place" in Iowa's burglary law). In short, the statute defines one crime, with one set of elements, broader than generic burglary — while specifying multiple means of fulfilling its locational element, some but not all of which (i.e., buildings and other structures, but not vehicles) satisfy the generic definition.

The District Court imposed an ACCA enhancement on Mathis after inspecting the records of his prior convictions and determining that he had burgled structures, rather than vehicles. See App. 34-35. The Court of Appeals for the Eighth Circuit affirmed. 786 F.3d 1068 (2015). It acknowledged that Iowa's burglary statute, by covering vehicles in addition to structures, swept more broadly than generic burglary. See id., at 1074. But it noted that if structures and vehicles were separate elements, each part of a different crime, then a sentencing court could invoke the modified categorical approach and look to old record materials to see which of those crimes the defendant had been convicted of. See id., at 1072-1074. And the Court of Appeals thought nothing changed if structures and vehicles were not distinct elements but only alternative means: "Whether [such locations] amount to alternative elements or merely alternative means to fulfilling an element," the Eighth Circuit held, a sentencing court "must apply the modified categorical approach" and inspect the records of prior cases. Id., at 1075. If the court found from those materials that the defendant had in fact committed the offense in a way that satisfied the definition of generic burglary — here, by burgling a structure rather than a vehicle — then the court should treat the conviction as an ACCA predicate. And that was so, the Court of Appeals stated, even though the elements of the crime of conviction, in encompassing both types of locations, were broader than those of the relevant generic offense. See id., at 1074-1075. In this circumstance, the court thus found, ACCA's usual elements-based inquiry would yield to a facts-based one.

That decision added to a Circuit split over whether ACCA's general rule — that a defendant's crime of conviction can count as a predicate only if its elements match those of a generic offense — gives way when a statute happens to list various means by which a defendant can satisfy an element.1 We granted certiorari to resolve that division, 577 U.S. ___, 136 S.Ct. 894, 193 L.Ed.2d 788 (2016), and now reverse.

II

A

As just noted, the elements of Mathis's crime of conviction (Iowa burglary) cover a greater swath of conduct than the elements of the relevant ACCA offense (generic burglary). See supra, at 2249-2250. Under our precedents, that undisputed disparity resolves this case. We have often held, and in no uncertain terms, that a state crime cannot qualify as an ACCA predicate if its elements are broader than those of a listed generic offense. See, e.g., Taylor, 495 U.S., at 602, 110 S.Ct. 2143. How a given defendant actually perpetrated the crime — what we have referred to as the "underlying brute facts or means" of commission, Richardson, 526 U.S., at 817, 119 S.Ct. 1707 — makes no difference; even if his conduct fits within the generic offense, the mismatch of elements saves the defendant from an ACCA sentence. Those longstanding principles, and the reasoning that underlies them, apply regardless of whether a statute omits or instead specifies alternative possible means of commission. The itemized construction gives a sentencing court no special warrant to explore the facts of an offense, rather than to determine the crime's elements and compare them with the generic definition.

Taylor set out the essential rule governing ACCA cases more than a quarter century ago. All that counts under the Act, we held then, are "the elements of the statute of conviction." 495 U.S., at 601, 110 S.Ct. 2143. So, for example, the label a State assigns to a crime — whether "burglary," "breaking and entering," or something else entirely — has no relevance to whether that offense is an ACCA predicate. See id., at 590-592, 110 S.Ct. 2143. And more to the point here: The same is true of "the particular facts underlying [the prior] convictions" — the means by which the defendant, in real life, committed his crimes. Id., at 600, 110 S.Ct. 2143. That rule can seem counterintuitive: In some cases, a sentencing judge knows (or can easily discover) that the defendant carried out a "real" burglary, even though the crime of conviction also extends to other conduct. No matter. Under ACCA, Taylor stated, it is impermissible for "a particular crime [to] sometimes count towards enhancement and sometimes not, depending on the facts of the case." Id., at 601, 110 S.Ct. 2143. Accordingly, a sentencing judge may look only to "the elements of the [offense], not to the facts of [the] defendant's conduct." Ibid.

That simple point became a mantra in our subsequent ACCA decisions.2 At the risk of repetition (perhaps downright tedium), here are some examples. In Shepard: ACCA "refers to predicate offenses in terms not of prior conduct but of prior `convictions' and the `element[s]' of crimes." 544 U.S., at 19, 125 S.Ct. 1254 (alteration in original). In James v. United States: "[W]e have avoided any inquiry into the underlying facts of [the defendant's] particular offense, and have looked solely to the elements of [burglary] as defined by [state] law." 550 U.S. 192, 214, 127 S.Ct. 1586, 167 L.Ed.2d 532 (2007). In Sykes v. United States: "[W]e consider [only] the elements of the offense[,] without inquiring into the specific conduct of this particular offender." 564 U.S. 1, 7, 131 S.Ct. 2267, 180 L.Ed.2d 60 (2011) (quoting James, 550 U.S., at 202, 127 S.Ct. 1586; emphasis in original). And most recently (and tersely) in Descamps: "The key [under ACCA] is elements, not facts." 570 U.S., at ___, 133 S.Ct., at 2283.

Our decisions have given three basic reasons for adhering to an elements-only inquiry. First, ACCA's text favors that approach. By enhancing the sentence of a defendant who has three "previous convictions" for generic burglary, § 924(e)(1) — rather than one who has thrice committed that crime — Congress indicated that the sentencer should ask only about whether "the defendant had been convicted of crimes falling within certain categories," and not about what the defendant had actually done. Taylor, 495 U.S., at 600, 110 S.Ct. 2143. Congress well knows how to instruct sentencing judges to look into the facts of prior crimes: In other statutes, using different language, it has done just that. See United States v. Hayes, 555 U.S. 415, 421, 129 S.Ct. 1079, 172 L.Ed.2d 816 (2009) (concluding that the phrase "an offense ... committed" charged sentencers with considering non-elemental facts); Nijhawan v. Holder, 557 U.S. 29, 36, 129 S.Ct. 2294, 174 L.Ed.2d 22 (2009) (construing an immigration statute to "call[] for a `circumstance-specific,' not a `categorical' interpretation"). But Congress chose another course in ACCA, focusing on only "the elements of the statute of conviction." Taylor, 495 U.S., at 601, 110 S.Ct. 2143.

Second, a construction of ACCA allowing a sentencing judge to go any further would raise serious Sixth Amendment concerns. This Court has held that only a jury, and not a judge, may find facts that increase a maximum penalty, except for the simple fact of a prior conviction. See Apprendi v. New Jersey, 530 U.S. 466, 490, 120 S.Ct. 2348, 147 L.Ed.2d 435 (2000). That means a judge cannot go beyond identifying the crime of conviction to explore the manner in which the defendant committed that offense. See Shepard, 544 U.S., at 25, 125 S.Ct. 1254 (plurality opinion); id., at 28, 125 S.Ct. 1254 (THOMAS, J., concurring in part and concurring in judgment) (stating that such an approach would amount to "constitutional error"). He is prohibited from conducting such an inquiry himself; and so too he is barred from making a disputed determination about "what the defendant and state judge must have understood as the factual basis of the prior plea" or "what the jury in a prior trial must have accepted as the theory of the crime." See id., at 25, 125 S.Ct. 1254 (plurality opinion); Descamps, 570 U.S., at ___, 133 S.Ct., at 2288. He can do no more, consistent with the Sixth Amendment, than determine what crime, with what elements, the defendant was convicted of.

And third, an elements-focus avoids unfairness to defendants. Statements of "non-elemental fact" in the records of prior convictions are prone to error precisely because their proof is unnecessary. Id., at ___, 133 S.Ct., at 2288-2289. At trial, and still more at plea hearings, a defendant may have no incentive to contest what does not matter under the law; to the contrary, he "may have good reason not to" — or even be precluded from doing so by the court. Ibid. When that is true, a prosecutor's or judge's mistake as to means, reflected in the record, is likely to go uncorrected. See ibid.3 Such inaccuracies should not come back to haunt the defendant many years down the road by triggering a lengthy mandatory sentence.

Those three reasons stay as strong as ever when a statute, instead of merely laying out a crime's elements, lists alternative means of fulfilling one (or more) of them. ACCA's use of the term "convictions" still supports an elements-based inquiry; indeed, that language directly refutes an approach that would treat as consequential a statute's reference to factual circumstances not essential to any conviction. Similarly, the Sixth Amendment problems associated with a court's exploration of means rather than elements do not abate in the face of a statute like Iowa's: Whether or not mentioned in a statute's text, alternative factual scenarios remain just that — and so remain off-limits to judges imposing ACCA enhancements. And finally, a statute's listing of disjunctive means does nothing to mitigate the possible unfairness of basing an increased penalty on something not legally necessary to a prior conviction. Whatever the statute says, or leaves out, about diverse ways of committing a crime makes no difference to the defendant's incentives (or lack thereof) to contest such matters.

For these reasons, the court below erred in applying the modified categorical approach to determine the means by which Mathis committed his prior crimes. 786 F.3d, at 1075. ACCA, as just explained, treats such facts as irrelevant: Find them or not, by examining the record or anything else, a court still may not use them to enhance a sentence. And indeed, our cases involving the modified categorical approach have already made exactly that point. "[T]he only [use of that approach] we have ever allowed," we stated a few Terms ago, is to determine "which element[s] played a part in the defendant's conviction." Descamps, 570 U.S., at ___, ___, 133 S.Ct., at 2283, 2285 (emphasis added); see Taylor, 495 U.S., at 602, 110 S.Ct. 2143 (noting that the modified approach may be employed only to determine whether "a jury necessarily had to find" each element of generic burglary). In other words, the modified approach serves — and serves solely — as a tool to identify the elements of the crime of conviction when a statute's disjunctive phrasing renders one (or more) of them opaque. See Descamps, 570 U.S., at ___, 133 S.Ct., at 2285.4 It is not to be repurposed as a technique for discovering whether a defendant's prior conviction, even though for a too-broad crime, rested on facts (or otherwise said, involved means) that also could have satisfied the elements of a generic offense.

B

The Government and Justice BREYER claim that our longtime and exclusive focus on elements does not resolve this case because (so they say) when we talked about "elements," we did not really mean it. "[T]he Court used `elements,'" the Government informs us, "not to distinguish between `means' and `elements,'" but instead to refer to whatever the statute lists — whether means or elements. Brief for United States 8; see id., at 19. In a similar vein, Justice BREYER posits that every time we said the word "element," we "used the word generally, simply to refer to the matter at issue," without "intend[ing] to set forth a generally applicable rule." Post, at 2265 (dissenting opinion).

But a good rule of thumb for reading our decisions is that what they say and what they mean are one and the same; and indeed, we have previously insisted on that point with reference to ACCA's elements-only approach. In Descamps, the sole dissenting Justice made an argument identical to the one now advanced by the Government and Justice BREYER: that our prior caselaw had not intended to distinguish between statutes listing alternative elements and those setting out "merely alternative means" of commission. 570 U.S., at ___, 133 S.Ct., at 2298 (opinion of ALITO, J.).5 The Court rejected that contention, stating that "[a]ll those decisions rested on the explicit premise that the laws contain[ed] statutory phrases that cover several different crimes, not several different methods of committing one offense" — in other words, that they listed alternative elements, not alternative means. Id., at ___, n. 2, 133 S.Ct., at 2285, n. 2 (ellipsis and internal quotation marks omitted); see, e.g., Johnson v. United States, 559 U.S. 133, 144, 130 S.Ct. 1265, 176 L.Ed.2d 1 (2010); Nijhawan, 557 U.S., at 35, 129 S.Ct. 2294. That premise was important, we explained, because an ACCA penalty may be based only on what a jury "necessarily found" to convict a defendant (or what he necessarily admitted). Descamps, 570 U.S., at ___, ___, 133 S.Ct., at 2287, 2290. And elements alone fit that bill; a means, or (as we have called it) "non-elemental fact," is "by definition[] not necessary to support a conviction." Id., at ___, n. 3, ___, 133 S.Ct., at 2286, n. 3, 2288; see supra, at 2248.6 Accordingly, Descamps made clear that when the Court had earlier said (and said and said) "elements," it meant just that and nothing else.

For that reason, this Court (including Justice BREYER) recently made clear that a court may not look behind the elements of a generally drafted statute to identify the means by which a defendant committed a crime. See Descamps, 570 U.S., at ___, 133 S.Ct., at 2282-2282. Consider if Iowa defined burglary as involving merely an unlawful entry into a "premises" — without any further elaboration of the types of premises that exist in the world (e.g., a house, a building, a car, a boat). Then, all agree, ACCA's elements-focus would apply. No matter that the record of a prior conviction clearly indicated that the defendant burgled a house at 122 Maple Road — and that the jury found as much; because Iowa's (hypothetical) law included an element broader than that of the generic offense, the defendant could not receive an ACCA sentence. Were that not so, this Court stated, "the categorical approach [would be] at an end"; the court would merely be asking "whether a particular set of facts leading to a conviction conforms to a generic ACCA offense." Id., at ___, 133 S.Ct., at 2291. That conclusion is common ground, and must serve as the baseline for anything Justice BREYER (or the Government) here argues.

And contrary to his view, that baseline not only begins but also ends the analysis, because nothing material changes if Iowa's law further notes (much as it does) that a "premises" may include "a house, a building, a car, or a boat." That fortuity of legislative drafting affects neither the oddities of applying the categorical approach nor the reasons for doing so. On the one hand, a categorical inquiry can produce the same counter-intuitive consequences however a state law is written. Whether or not the statute lists various means of satisfying the "premises" element, the record of a prior conviction is just as likely to make plain that the defendant burgled that house on Maple Road and the jury knew it. On the other hand (and as already shown), the grounds — constitutional, statutory, and equitable — that we have offered for nonetheless using the categorical approach lose none of their force in the switch from a generally phrased statute (leaving means implicit) to a more particular one (expressly enumerating them). See supra, at 2253. In every relevant sense, both functional and legal, the two statutes — one saying just "premises," the other listing structures and vehicles — are the same. And so the same rule must apply: ACCA disregards the means by which the defendant committed his crime, and looks only to that offense's elements.

C

The first task for a sentencing court faced with an alternatively phrased statute is thus to determine whether its listed items are elements or means. If they are elements, the court should do what we have previously approved: review the record materials to discover which of the enumerated alternatives played a part in the defendant's prior conviction, and then compare that element (along with all others) to those of the generic crime. See ibid. But if instead they are means, the court has no call to decide which of the statutory alternatives was at issue in the earlier prosecution. Given ACCA's indifference to how a defendant actually committed a prior offense, the court may ask only whether the elements of the state crime and generic offense make the requisite match.

This threshold inquiry — elements or means? — is easy in this case, as it will be in many others. Here, a state court decision definitively answers the question: The listed premises in Iowa's burglary law, the State Supreme Court held, are "alternative method[s]" of committing one offense, so that a jury need not agree whether the burgled location was a building, other structure, or vehicle. See Duncan, 312 N.W.2d, at 523; supra, at 2250. When a ruling of that kind exists, a sentencing judge need only follow what it says. See Schad, 501 U.S., at 636, 111 S.Ct. 2491 (plurality opinion). Likewise, the statute on its face may resolve the issue. If statutory alternatives carry different punishments, then under Apprendi they must be elements. See, e.g., Colo.Rev.Stat. § 18-4-203 (2015); Vt. Stat. Ann., Tit. 13, § 1201 (Cum. Supp. 2015); see also 530 U.S., at 490, 120 S.Ct. 2348 (requiring a jury to agree on any circumstance increasing a statutory penalty); supra, at 2252. Conversely, if a statutory list is drafted to offer "illustrative examples," then it includes only a crime's means of commission. United States v. Howard, 742 F.3d 1334, 1348 (C.A.11 2014); see United States v. Cabrera-Umanzor, 728 F.3d 347, 353 (C.A.4 2013). And a statute may itself identify which things must be charged (and so are elements) and which need not be (and so are means). See, e.g., Cal.Penal Code Ann. § 952 (West 2008). Armed with such authoritative sources of state law, federal sentencing courts can readily determine the nature of an alternatively phrased list.

And if state law fails to provide clear answers, federal judges have another place to look: the record of a prior conviction itself. As Judge Kozinski has explained, such a "peek at the [record] documents" is for "the sole and limited purpose of determining whether [the listed items are] element[s] of the offense." Rendon v. Holder, 782 F.3d 466, 473-474 (C.A.9 2015) (opinion dissenting from denial of reh'g en banc).7 (Only if the answer is yes can the court make further use of the materials, as previously described, see supra, at 2253-2254.) Suppose, for example, that one count of an indictment and correlative jury instructions charge a defendant with burgling a "building, structure, or vehicle" — thus reiterating all the terms of Iowa's law. That is as clear an indication as any that each alternative is only a possible means of commission, not an element that the prosecutor must prove to a jury beyond a reasonable doubt. So too if those documents use a single umbrella term like "premises": Once again, the record would then reveal what the prosecutor has to (and does not have to) demonstrate to prevail. See Descamps, 570 U.S., at ___ 133 S.Ct., at 2290. Conversely, an indictment and jury instructions could indicate, by referencing one alternative term to the exclusion of all others, that the statute contains a list of elements, each one of which goes toward a separate crime. Of course, such record materials will not in every case speak plainly, and if they do not, a sentencing judge will not be able to satisfy "Taylor's demand for certainty" when determining whether a defendant was convicted of a generic offense. Shepard, 544 U.S., at 21, 125 S.Ct. 1254. But between those documents and state law, that kind of indeterminacy should prove more the exception than the rule.

III

Our precedents make this a straightforward case. For more than 25 years, we have repeatedly made clear that application of ACCA involves, and involves only, comparing elements. Courts must ask whether the crime of conviction is the same as, or narrower than, the relevant generic offense. They may not ask whether the defendant's conduct — his particular means of committing the crime — falls within the generic definition. And that rule does not change when a statute happens to list possible alternative means of commission: Whether or not made explicit, they remain what they ever were — just the facts, which ACCA (so we have held, over and over) does not care about.

Some have raised concerns about this line of decisions, and suggested to Congress that it reconsider how ACCA is written. See, e.g., Chambers v. United States, 555 U.S. 122, 133, 129 S.Ct. 687, 172 L.Ed.2d 484 (2009) (ALITO, J., concurring in judgment); Descamps, 570 U.S., at ___, 133 S.Ct., at 2293-2294 (KENNEDY, J., concurring). But whether for good or for ill, the elements-based approach remains the law. And we will not introduce inconsistency and arbitrariness into our ACCA decisions by here declining to follow its requirements. Everything this Court has ever said about ACCA runs counter to the Government's position. That alone is sufficient reason to reject it: Coherence has a claim on the law.

Because the elements of Iowa's burglary law are broader than those of generic burglary, Mathis's convictions under that law cannot give rise to an ACCA sentence. We accordingly reverse the judgment of the Court of Appeals.

It is so ordered.

Justice KENNEDY, concurring.

The Court's opinion is required by its precedents, and so I join it, with one reservation set forth below.

In no uncertain terms, the Court has held that the word "burglary" in the Armed Career Criminal Act (ACCA) "refers to the elements of the statute of conviction, not to the facts of each defendant's conduct." Taylor v. United States, 495 U.S. 575, 601, 110 S.Ct. 2143, 109 L.Ed.2d 607 (1990). An enhancement is proper, the Court has said, if a defendant is convicted of a crime "having the elements" of generic burglary, "regardless of its exact definition or label" under state law. Id., at 599, 110 S.Ct. 2143. See also Descamps v. United States, 570 U.S. ___, ___, 133 S.Ct. 2276, 2285, 186 L.Ed.2d 438 (2013) ("[T]he categorical approach's central feature [is] a focus on the elements, rather than the facts, of a crime"). In the instant case, then, the Court is correct to conclude that "an elements-based approach remains the law." Ante. at 2255. And it is correct to note further that it would "introduce inconsistency and arbitrariness into our ACCA decisions by here declining to follow its requirements," without reconsidering our precedents as a whole. Ibid.

My one reservation to the Court's opinion concerns its reliance on Apprendi v. New Jersey, 530 U.S. 466, 120 S.Ct. 2348, 147 L.Ed.2d 435 (2000). Ante at 2252. In my view, Apprendi was incorrect and, in any event, does not compel the elements based approach. That approach is required only by the Court's statutory precedents, which Congress remains free to overturn.

As both dissenting opinions point out, today's decision is a stark illustration of the arbitrary and inequitable results produced by applying an elements based approach to this sentencing scheme. It could not have been Congress' intent for a career offender to escape his statutorily mandated punishment "when the record makes it clear beyond any possible doubt that [he] committed generic burglary." Post, at 2270 (opinion of ALITO, J.). Congress also could not have intended vast sentencing disparities for defendants convicted of identical criminal conduct in different jurisdictions.

Congress is capable of amending the ACCA to resolve these concerns. See, e.g., Nijhawan v. Holder, 557 U.S. 29, 38, 129 S.Ct. 2294, 174 L.Ed.2d 22 (2009) (interpreting the language Congress used in 8 U.S.C. § 1101(a)(43)(M)(i) as requiring a "circumstance-specific" rather than categorical approach). But continued congressional inaction in the face of a system that each year proves more unworkable should require this Court to revisit its precedents in an appropriate case.

Justice THOMAS, concurring.

I join the Court's opinion, which faithfully applies our precedents. The Court holds that the modified categorical approach cannot be used to determine the specific means by which a defendant committed a crime. Ante, at 2253-2254. By rightly refusing to apply the modified categorical approach, the Court avoids further extending its precedents that limit a criminal defendant's right to a public trial before a jury of his peers.

In Almendarez-Torres v. United States, 523 U.S. 224, 246-247, 118 S.Ct. 1219, 140 L.Ed.2d 350 (1998), the Court held that the existence of a prior conviction triggering enhanced penalties for a recidivist was a fact that could be found by a judge, not an element of the crime that must be found by a jury. Two years later, the Court held that "any fact that increases the penalty for a crime beyond the prescribed statutory maximum" is an element of a crime and therefore "must be submitted to a jury, and proved beyond a reasonable doubt." Apprendi v. New Jersey, 530 U.S. 466, 490, 120 S.Ct. 2348, 147 L.Ed.2d 435 (2000); see id., at 489-490, 120 S.Ct. 2348. But Apprendi recognized an exception for the "fact of a prior conviction," instead of overruling Almendarez-Torres. See 530 U.S., at 490, 120 S.Ct. 2348. I continue to believe that the exception in Apprendi was wrong, and I have urged that Almendarez-Torres be reconsidered. See Descamps v. United States, 570 U.S. ___, ___, 133 S.Ct. 2276, 2294-2295, 186 L.Ed.2d 438 (2013) (THOMAS, J., concurring in judgment).

Consistent with this view, I continue to believe that depending on judge-found facts in Armed Career Criminal Act (ACCA) cases violates the Sixth Amendment and is irreconcilable with Apprendi. ACCA improperly "allows the judge to `mak[e] a finding that raises [a defendant's] sentence beyond the sentence that could have lawfully been imposed by reference to facts found by the jury or admitted by the defendant.'" Descamps, supra, at ___-___, 133 S.Ct., at 2294-2295 (opinion of THOMAS, J.) (brackets in original; internal quotation marks omitted). This Sixth Amendment problem persists regardless of whether "a court is determining whether a prior conviction was entered, or attempting to discern what facts were necessary to a prior conviction." Id., at ___, 133 S.Ct., at 2294 (citation omitted).

Today, the Court "at least limits the situations in which courts make factual determinations about prior convictions." Ibid. As the Court explains, the means of committing an offense are nothing more than "various factual ways of committing some component of the offense." Ante, at 2249. Permitting judges to determine the means of committing a prior offense would expand Almendarez-Torres. Therefore, I join the Court's opinion refusing to allow judges to determine, without a jury, which alternative means supported a defendant's prior convictions.

Justice BREYER, with whom Justice GINSBURG joins, dissenting.

The elements/means distinction that the Court draws should not matter for sentencing purposes. I fear that the majority's contrary view will unnecessarily complicate federal sentencing law, often preventing courts from properly applying the sentencing statute that Congress enacted. I consequently dissent.

I

The federal statute before us imposes a mandatory minimum sentence upon a person convicted of being a felon in possession of a firearm if that person also has three previous convictions for (among several other things) "burglary." 18 U.S.C. § 924(e)(2)(B)(ii). The petitioner here has been convicted of being a felon in possession, and he previously was convicted of three other crimes that qualify him for the federal mandatory minimum if, but only if, those previous convictions count as "burglary." To decide whether he has committed what the federal statute calls a "burglary," we must look to the state statute that he violated.

The relevant state statute, an Iowa statute, says that a person commits a crime if he (1) "enters an occupied structure," (2) "having no right ... to do so," (3) with "the intent to commit a felony." Iowa Code § 713.1 (2013). It then goes on to define "occupied structure" as including any (1) "building," (2) "structure," (3) "land" vehicle, (4) "water" vehicle, or (5) "air vehicle, or similar place." § 702.12. The problem arises because, as we have previously held, see Taylor v. United States, 495 U.S. 575, 602, 110 S.Ct. 2143, 109 L.Ed.2d 607 (1990), if the structure that an offender unlawfully entered (with intent to commit a felony) was a "building," the state crime that he committed counts under the federal statute as "burglary." But if the structure that the offender unlawfully entered was a land, water, or air vehicle, the state crime does not count as a "burglary." Thus, a conviction for violating the state statute may, or may not, count as a "burglary," depending upon whether the structure that he entered was, say, a "building" or a "water vehicle."

Here, if we look at the court documents charging Mathis with a violation of the state statute, they tell us that he was charged with entering, for example, a "house and garage." App. 60-73 (charging documents). They say nothing about any other structure, say, a "water vehicle." Thus, to convict him, the jury — which had to find that he unlawfully entered an "occupied structure" — must have found that he entered a "house and garage," which concededly count as "building[s]." So why is that not the end of this matter? Why does the federal statute not apply?

Just to be sure, let us look at how we previously treated an almost identical instance. In Taylor, a state statute made criminal the "breaking and entering [of] a building, booth, tent, boat, or railroad car." 495 U.S., at 579, n. 1, 110 S.Ct. 2143. We explained that breaking into a building would amount to "burglary" under the federal statute, but breaking into a railroad car would not. But the conviction document itself said only that the offender had violated the statute; it did not say whether he broke into a building or a railroad car. See id., at 598-602, 110 S.Ct. 2143. We said that in such a case the federal sentencing judge could look at the charging papers and the jury instructions in the state case to try to determine what the state conviction was actually for: building, tent, or railroad car. We wrote that

(We later added that where a conviction rests upon an offender's guilty plea, the federal judge can look to the facts that the offender admitted at his plea colloquy for the same purpose. See Shepard v. United States, 544 U.S. 13, 20-21, 125 S.Ct. 1254, 161 L.Ed.2d 205 (2005).)

So, again, what is the problem? The State's "burglary statut[e] include[s] entry" of a vehicle as well as a "building." Taylor, 495 U.S., at 602, 110 S.Ct. 2143. The conviction document might not specify what kind of a structure the defendant entered (i.e., whether a building or an automobile). But the federal sentencing judge can look at the charging documents (or plea colloquy) to see whether "the defendant was charged only with a burglary of a building." Ibid. And here that was so. In addition, since the charging documents show that the defendant was charged only with illegal entry of a "building" — not a tent or a railroad car — the jury, in order to find (as it did) that the defendant broke into an occupied structure, would "necessarily [have] had to find an entry of a building." Ibid. Hence, "the Government should be allowed to use the conviction for enhancement." Ibid.

The majority, however, does not agree that the two cases I have described are almost identical. To the contrary, it notes correctly that our precedent often uses the word "element" to describe the relevant facts to which a statute refers when it uses words such as "building," "tent," "boat," or "railroad car." See, e.g., ante, at 2251-2252. It points out that, here, the Iowa Supreme Court described those words as referring, not to "elements" of a crime, but rather to "means" through which a crime was committed. See ante, at 2249-2250. And that fact, in the majority's view, makes all the difference. See ante, at 2254-2256. But why? I, of course, see that there is a distinction between means and elements in the abstract, but — for sentencing purposes — I believe that it is a distinction without a difference.

II

I begin with a point about terminology. All the relevant words in this case, such as "building," "structure," "water vehicle," and the like, are statutory words. Moreover, the statute uses those words to help describe a crime. Further, the statute always uses those words to designate facts. Whether the offender broke into a building is a fact; whether he broke into a water vehicle is a fact. Sometimes, however, a State may treat certain of those facts as elements of a crime. And sometimes a State may treat certain of those facts as means of committing a crime. So far, everyone should agree. See Richardson v. United States, 526 U.S. 813, 817, 119 S.Ct. 1707, 143 L.Ed.2d 985 (1999) (describing both "elements" and "means" as "facts"). Where we disagree is whether that difference, relevant to the application of state law, should make a difference for federal sentencing purposes.

III

Whether a State considers the statutory words "boat" or "building" to describe elements of a crime or a means of committing a crime can make a difference for purposes of applying the State's criminal law, but it should not make a difference in respect to the sentencing question at issue here. The majority, I believe, reasons something like this: Suppose the jury unanimously agreed that the defendant unlawfully entered some kind of structure with felonious intent, but the jury is deadlocked six to six as to whether that structure is (1) a "boat" or (2) a "house." If the statute uses those two words to describe two different elements of two different crimes — i.e., (1) breaking into a boat, and (2) breaking into a house — then the defendant wins, for the jury has not found unanimously each element of either crime. But if the statute uses those two words to describe two different means of committing the same crime — i.e., breaking into an occupied structure that consists of either a house or a boat — then the defendant loses, for (as long as the jury decides unanimously that the defendant broke into an occupied structure of whichever kind) the jury need not decide unanimously which particular means the defendant used to commit the crime. See ante, at 2248-2250.

I accept that reasoning. But I do not see what it has to do with sentencing. In the majority's view, the label "means" opens up the possibility of a six-to-six jury split, and it believes that fact would prevent us from knowing whether the conviction was for breaking into a "building" or a "boat." See ante, at 2249-2250. But precisely the same is true were we to use the label "element" to describe the facts set forth in the state statute. The federal sentencing judge may see on the defendant's record a conviction for violating a particular provision of the state criminal code; that code may list in a single sentence both "buildings" and "boats"; the State may interpret the two words as separate elements of two separate crimes; and the federal judge will not know from the simple fact of conviction for violating the statute (without more) which of the two crimes was at issue (that is, was it the one aimed at burglaries of buildings, or the one aimed at burglaries of boats?). That is why the Court said in Taylor that in such a case the federal judge may look to the "indictment or information and jury instructions" to determine whether "the jury necessarily had to find an entry of a building," rather than a boat, "to convict." 495 U.S., at 602, 110 S.Ct. 2143. If so, the federal judge may count the conviction as falling within the federal statutory word "burglary" and use it for sentencing.

In my view, precisely the same is true if the state courts label the statute-mentioned facts ("building," "boat," etc.) as "means" rather than "elements." The federal judge should be able to "look ... to" the charging documents and the plea agreement to see if "the jury necessarily had to find an entry of a building," rather than a boat, "to convict." Ibid. If so, the federal judge should be able to count the conviction as a federal-statute "burglary" conviction and use it for sentencing.

Of course, sometimes the charging documents will not give us the answer to the question. But often they will. If, for example, the charging document accuses Smith of breaking and entering into a house (and does not mention any other structure), then (1) the jury had to find unanimously that he broke into a "house," if "house" is an element, and (2) the jury had to find unanimously that he broke into a "house," if "house" is the only means charged. (Otherwise the jury would not have unanimously found that he broke into an "occupied structure," which is an element of the statutory crime.)

Suppose, for example, that breaking into a "building" is an element of Iowa's burglary crime; and suppose the State charges that Smith broke into a building located in Des Moines (and presents evidence at trial concerning only a Des Moines offense), but the jury returns its verdict on a special-verdict form showing that six jurors voted for guilt on the theory that he broke into a building located in Detroit — not Des Moines. The conviction would fail (at least in Iowa), would it not? See, e.g., State v. Bratthauer, 354 N.W.2d 774, 776 (Iowa 1984) ("If substantial evidence is presented to support each alternative method of committing a single crime, and the alternatives are not repugnant to each other, then unanimity of the jury as to the mode of commission of the crime is not required. At the root of this standard is the principle that the unanimity rule requires jurors to be in substantial agreement as to just what a defendant did as a step preliminary to determining whether the defendant is guilty of the crime charged" (emphasis added; citation, brackets, and internal quotation marks omitted)). Similarly, we would know that — if the charging documents claim only that the defendant broke into a house, and the Government presented proof only of that kind of burglary — the jury had to find unanimously that he broke into a house, not a boat. And that is so whether state law considers the statutory word "house" to be an element or a means. I have not found any nonfanciful example to the contrary.

IV

Consider the federal statute before us — the statute that contains the word "burglary" — from a more general sentencing perspective. By way of background, it is important to understand that, as a general matter, any sentencing system must embody a host of compromises between theory and practicality. From the point of view of pure theory, there is much to be said for "real offense" sentencing. Such a system would require a commission or a sentencing judge to determine in some detail "the actual conduct in which the defendant engaged," i.e., what the defendant really did now and in the past. United States Sentencing Commission (USSC), Guidelines Manual ch. 1, pt. A, p. 5 (Nov. 2015). Such a system would produce greater certainty that two offenders who engaged in (and had previously engaged in) the same real conduct would be punished similarly. See ibid.

Pure "real offense" sentencing, however, is too complex to work. It requires a sentencing judge (or a sentencing commission) to know all kinds of facts that are difficult to discover as to present conduct and which a present sentencing judge could not possibly know when he or she seeks to determine what conduct underlies a prior conviction. Because of these practical difficulties, the USSC created Guidelines that in part reflect a "charge offense" system, a system based "upon the conduct that constitutes the elements of the offense for which the defendant was charged and of which he was convicted." Ibid.

A pure "charge offense" system, however, also has serious problems. It can place great authority to determine a sentence in the hands of the prosecutor, not the judge, creating the very nonuniformity that a commission would hope to minimize. Hence, the actual federal sentencing system retains "a significant number of real offense elements," allowing adjustments based upon the facts of a defendant's case. Id., at 6. And the Commission is currently looking for new ways to create a better compromise. See, e.g., USSC, Amendments to the Sentencing Guidelines, at 24 (Apr. 2016) (effective Nov. 1, 2016) (creating a "sentence-imposed model for determining" whether prior convictions count for sentence-enhancement purposes in the context of certain immigration crimes).

With this background in mind, turn to the federal statute before us. The statute, reflecting the impossibility of knowing in detail the conduct that underlies a prior conviction, uses (in certain cases involving possession of weapons) the fact of certain convictions (including convictions for burglary) as (conclusive) indications that the present defendant has previously engaged in highly undesirable conduct. And, for the general reasons earlier described, it is practical considerations, not a general theory, that would prevent Congress from listing the specific prior conduct that would warrant a higher present sentence. Practical considerations, particularly of administration, can explain why Congress did not tell the courts precisely how to apply its statutory word "burglary." And similar practical considerations can help explain why this Court, in Taylor and later cases, described a modified categorical approach for separating the sheep from the goats. Those cases recognize that sentencing judges have limited time, they have limited information about prior convictions, and — within practical constraints — they must try to determine whether a prior conviction reflects the kind of behavior that Congress intended its proxy (i.e., "burglary") to cover.

The majority's approach, I fear, is not practical. Perhaps the statutes of a few States say whether words like "boat" or "building" stand for an element of a crime or a means to commit a crime. I do not know. I do know, however, that many States have burglary statutes that look very much like the Iowa statute before us today. See, e.g., Colo.Rev.Stat. §§ 18-4-101, 18-4-202, 18-4-203 (2015); Mont. Code Ann. §§ 45-2-101, 45-6-201, 45-6-204 (2015); N.H.Rev.Stat. Ann. § 635:1 (2015); N.D. Cent. Code Ann. §§ 12.1-22-02, 12.1-22-06 (2012); Ohio Rev.Code Ann. §§ 2909.01, 2911.11-2911.13 (Lexis 2014); 18 Pa. Cons.Stat. Ann. §§ 3501, 3502 (2015); S.D. Codified Laws §§ 22-1-2, 22-32-1, 22-32-3, 22-32-8 (2006); Wyo. Stat. Ann. §§ 6-1-104, 6-3-301 (2015); see also ALI, Model Penal Code §§ 221.0, 221.1 (1980); cf. Taylor, 495 U.S., at 598, 110 S.Ct. 2143 ("burglary" in the federal statute should reflect the version of burglary "used in the criminal codes of most States"). I also know that there are very few States where one can find authoritative judicial opinions that decide the means/element question. In fact, the Government told us at oral argument that it had found only "two States" that, in the context of burglary, had answered the means/elements question. Tr. of Oral Arg. 45; see id., at 37.

The lack of information is not surprising. After all, a prosecutor often will charge just one (e.g., a "building") of several statutory alternatives. See Descamps v. United States, 570 U.S. ___, ___, 133 S.Ct. 2276, 2283-2284, 186 L.Ed.2d 438 (2013). A jury that convicts, then, would normally have to agree unanimously about the existence of that particular fact. See Richardson, 526 U.S., at 818, 119 S.Ct. 1707 ("Our decision [whether something is an element or a means] will make a difference where... the Government introduces evidence that the defendant has committed more underlying drug crimes than legally necessary to make up a `series'"). Hence, it will not matter for that particular case whether the State, as a general matter, would categorize that fact (to which the statute refers) as an "element" or as a "means."

So on the majority's approach, what is a federal sentencing judge to do when facing a state statute that refers to a "building," a "boat," a "car," etc.? The charging documents will not answer the question, for — like the documents at issue here — they will simply charge entry into, say, a "building," without more. But see ante, at 2256-2257 (suggesting that a defendant's charging documents will often answer the question). The parties will have to look to other state cases to decide whether that fact is a "means" or an "element." That research will take time and is likely not to come up with an answer. What was once a simple matter will produce a time-consuming legal tangle. See, e.g., State v. Peterson, 168 Wn.2d 763, 769, 230 P.3d 588, 591 (2010) ("`There is simply no bright-line rule by which the courts can determine whether the legislature intended to provide alternate means of committing a particular crime. Instead, each case must be evaluated on its own merits'" (brackets omitted)); State v. Brown, 295 Kan. 181, 192, 284 P.3d 977, 987 (2012) (the "alternative means" definition is "mind-bending in its application"). That is why lower court judges have criticized the approach the majority now adopts. See, e.g., Omargharib v. Holder, 775 F.3d 192, 200 (C.A.4 2014) (Niemeyer, J., concurring) ("Because of the ever-morphing analysis and the increasingly blurred articulation of applicable standards, we are being asked to decide, without clear and workable standards, whether disjunctive phrases in a criminal law define alternative elements of a crime or alternative means of committing it.... I find it especially difficult to comprehend the distinction" (emphasis deleted)).

V

The majority bases its conclusion primarily upon precedent. In my view, precedent does not demand the conclusion that the majority reaches. I agree with the majority that our cases on the subject have all used the word "element" in contexts similar to the present context. But that fact is hardly surprising, for all the cases in which that word appears involved elements — or at least the Court assumed that was so. See Descamps, 570 U.S., at ___, n. 2, 133 S.Ct., at 2285, n. 2. In each of those cases, the Court used the word generally, simply to refer to the matter at issue, without stating or suggesting any view about the subject of the present case. See, e.g., id., at ___, 133 S.Ct., at 2283 ("Sentencing courts may look only to the statutory definitions — i.e., the elements — of a defendant's prior offenses" (internal quotation marks omitted)); Shepard, 544 U.S., at 16-17, 125 S.Ct. 1254 (using the terms "statutory definition" and "statutory elements" interchangeably); Taylor, 495 U.S., at 602, 110 S.Ct. 2143 ("[A]n offense constitutes `burglary' for purposes of [the Armed Career Criminal Act] if either its statutory definition substantially corresponds to `generic' burglary, or the charging paper and jury instructions actually required the jury to find all the elements of generic burglary").

The genius of the common law consists in part in its ability to modify a prior holding in light of new circumstances, particularly where, as Justice Holmes said, an existing principle runs up against a different principle that requires such modification. See Holmes, The Path of the Law, 10 Harv. L. Rev. 457, 469 (1897). A fortiori, we should not apply this Court's use of a word in a prior case — a word that was not necessary to the decision of the prior case, and not intended to set forth a generally applicable rule — to a new circumstance that differs significantly in respect to both circumstances and the legal question at issue.

Does Apprendi v. New Jersey, 530 U.S. 466, 120 S.Ct. 2348, 147 L.Ed.2d 435 (2000), require the majority's result here? There we held that any fact ("[o]ther than the fact of a prior conviction") that must be proved in order to increase the defendant's sentence above what would otherwise be the statutory maximum must be proved to a jury beyond a reasonable doubt. Id., at 490, 120 S.Ct. 2348. Where, as here, the State charges only one kind of "occupied structure" — namely, entry into a "garage" — that criterion is met. The State must prove to the jury beyond a reasonable doubt that the defendant unlawfully entered a garage. And that is so, whether the statute uses the term "garage" to refer to a fact that is a means or a fact that is an element. If the charging papers simply said "occupied structure," leaving the jury free to disagree about whether that structure was a "garage" or was, instead, a "boat," then we lack the necessary assurance about jury unanimity; and the sentencing judge consequently cannot use that conviction as a basis for an increased federal sentence. And that is true whether the state statute, when using the words "garage" and "boat," intends them to refer to a fact that is a means or a fact that is an element.

What about Descamps? The statute there at issue made it a crime to "ente[r] certain locations with intent to commit grand or petit larceny or any felony." 570 U.S., at ___, 133 S.Ct., at 2282 (internal quotation marks omitted). The statute made no distinction between (1) lawful entry (e.g., entering a department store before closing time) and (2) unlawful entry (e.g., breaking into a store after it has closed). See ibid. The difference matters because unlawful entry is a critical constituent of the federal statute's version of "burglary." If the entry is lawful, the crime does not fall within the scope of that word.

We held that a conviction under this statute did not count as a "burglary" for federal purposes. We reasoned that the statute required the Government only to prove "entry," that there was no reason to believe that charging documents would say whether the entry was lawful or unlawful, and that, "most important[ly]," even if they did, the jury did not have to decide that the entry was unlawful in order to convict (that is, any description in the charging document that would imply or state that the entry was illegal, say, at 2:00 in the morning, would be coincidental). Id., at ___, 133 S.Ct., at 2290; see id., at ___, 133 S.Ct., at 2288.

Here, by way of contrast, the charging documents must allege entry into an "occupied structure," and that "structure" can consist of one of several statutory alternatives. Iowa Code §§ 713.1, 702.12. The present law thus bears little resemblance to the hypothetical statute the majority describes. That hypothetical statute makes it a crime to break into a "premises" without saying more. Ante, at 2255-2256. Thus, to apply the federal sentencing statute to such a nonspecific, hypothetical statute would require sentencing judges to "imaginatively transfor[m]" "every element of [the] statute ... so that [the] crime is seen as containing an infinite number of sub-crimes corresponding to `all the possible ways an individual can commit'" the crime — an impossibly difficult task. Descamps, 570 U.S., at ___-___, 133 S.Ct. at 2291.

But the Iowa statute before us contains explicit (not hypothetical) statutory alternatives, and therefore it is likely (not unlikely) that the charging documents will list one or more of these alternatives. Indeed, that is the case with each of Mathis' charging documents. See App. 60-73. And if the charging documents list only one of these alternatives, say, a "building," the jury normally would have to find unanimously that the defendant entered into a building in order to convict. See Bratthauer, 354 N.W.2d, at 776. To repeat my central point: In my view, it is well within our precedent to count a state burglary conviction as a "burglary" within the meaning of the federal law where (1) the statute at issue lists the alternative means by which a defendant can commit the crime (e.g., burgling a "building" or a "boat") and (2) the charging documents make clear that the state alleged (and the jury or trial judge necessarily found) only an alternative that matches the federal version of the crime.

Descamps was not that kind of case. It concerned a statute that did not explicitly list alternative means for commission of the crime. And it concerned a fact extraneous to the crime — the fact (whether entry into the burgled structure was lawful or unlawful) was neither a statutory means nor an element. As the Court in that case described it, the fact at issue was, under the state statute, a "legally extraneous circumstanc[e]" of the State's case. 570 U.S., at ___, 133 S.Ct., at 2288. But this case concerns a fact necessary to the crime (regardless of whether the Iowa Supreme Court generally considers that fact to be a means or an element).

Precedent, by the way, also includes Taylor. And, as I have pointed out, Taylor says that the modified categorical approach it sets forth may "permit the sentencing court to go beyond the mere fact of conviction in a narrow range of cases where a jury was actually required to find all the elements of generic burglary." 495 U.S., at 602, 110 S.Ct. 2143. Taylor is the precedent that I believe governs here. Because the majority takes a different view, with respect, I dissent.

Justice ALITO, dissenting.

Sabine Moreau lives in Solre-sur-Sambre, a town in Belgium located 38 miles south of Brussels. One day she set out in her car to pick up a friend at the Brussels train station, a trip that should have taken under an hour. She programmed her GPS and headed off. Although the GPS sent her south, not north, she apparently thought nothing of it. She dutifully stayed on the prescribed course. Nor was she deterred when she saw road signs in German for Cologne, Aachen, and Frankfurt. "I asked myself no questions," she later recounted. "I kept my foot down."1

Hours passed. After crossing through Germany, she entered Austria. Twice she stopped to refuel her car. She was involved in a minor traffic accident. When she tired, she pulled over and slept in her car. She crossed the Alps, drove through Slovenia, entered Croatia, and finally arrived in Zagreb — two days and 900 miles after leaving her home. Either she had not properly set her GPS or the device had malfunctioned. But Ms. Moreau apparently refused to entertain that thought until she arrived in the Croatian capital. Only then, she told reporters, did she realize that she had gone off course, and she called home, where the police were investigating her disappearance.

Twenty-six years ago, in Taylor v. United States, 495 U.S. 575, 602, 110 S.Ct. 2143, 109 L.Ed.2d 607 (1990), this Court set out on a journey like Ms. Moreau's. Our task in Taylor, like Ms. Moreau's short trip to the train station, might not seem very difficult — determining when a conviction for burglary counts as a prior conviction for burglary under the Armed Career Criminal Act (ACCA), 18 U.S.C. § 924(e). But things have not worked out that way.

Congress enacted ACCA to ensure that violent repeat criminal offenders could be subject to enhanced penalties — that is, longer prison sentences — in a fair and uniform way across States with myriad criminal laws. See Descamps v. United States, 570 U.S. ___, ___-___, 133 S.Ct. 2276, 2301-2302, 186 L.Ed.2d 438 (2013) (ALITO, J., dissenting). ACCA calls for an enhanced sentence when a defendant, who has three or more prior convictions for a "violent felony," is found guilty of possession of a firearm. § 924(e)(1). And ACCA provides that the term "violent felony" means, among other things, "any crime punishable by imprisonment for a term exceeding one year ... that ... is burglary." § 924(e)(2)(B). In other words, "burglary" = "violent felony."

While this language might seem straightforward, Taylor introduced two complications. First, Taylor held that "burglary" under ACCA means offenses that have the elements of what the Court called "generic" burglary, defined as unlawfully entering or remaining in a building or structure with the intent to commit a crime. 495 U.S., at 598, 110 S.Ct. 2143. This definition is broader than that of the common law but does not include every offense that States have labeled burglary, such as the burglary of a boat or vehicle. Second, Taylor and subsequent cases have limited the ability of sentencing judges to examine the record in prior cases for the purpose of determining whether the convictions in those cases were for "generic burglary." See, e.g., Shepard v. United States, 544 U.S. 13, 26, 125 S.Ct. 1254, 161 L.Ed.2d 205 (2005). We have called this the "modified categorical approach." Descamps, supra, at ___-___, 133 S.Ct., at 2281-2282.

Programmed in this way, the Court set out on a course that has increasingly led to results that Congress could not have intended.2 And finally, the Court arrives at today's decision, the upshot of which is that all burglary convictions in a great many States may be disqualified from counting as predicate offenses under ACCA. This conclusion should set off a warning bell. Congress indisputably wanted burglary to count under ACCA; our course has led us to the conclusion that, in many States, no burglary conviction will count; maybe we made a wrong turn at some point (or perhaps the Court is guided by a malfunctioning navigator). But the Court is unperturbed by its anomalous result. Serenely chanting its mantra, "Elements," see ante, at 2251, the Court keeps its foot down and drives on.

The Court's approach calls for sentencing judges to delve into pointless abstract questions. In Descamps, the Court gave sentencing judges the assignment of determining whether a state statute is "divisible." See 570 U.S., at ___, 133 S.Ct., at 2293. When I warned that this novel inquiry would prove to be difficult, the opinion of the Court brushed off that concern, see id., at ___, 133 S.Ct., at 2285, n. 2 ("[W]e can see no real-world reason to worry"). But lower court judges, who must regularly grapple with the modified categorical approach, struggled to understand Descamps. Compare Rendon v. Holder, 764 F.3d 1077, 1084-1090 (C.A.9 2014) (panel opinion), with 782 F.3d 466, 466-473 (C.A.9 2015) (eight judges dissenting from denial of reh'g en banc), and id., at 473-474 (Kozinski, J., dissenting from denial of reh'g en banc). Now the Court tells them they must decide whether entering or remaining in a building is an "element" of committing a crime or merely a "means" of doing so. I wish them good luck.

The distinction between an "element" and a "means" is important in a very different context: The requisite number of jurors (all 12 in most jurisdictions) must agree that a defendant committed each element of an offense, but the jurors need not agree on the means by which an element was committed. So if entering or remaining in a building is an element, the jurors must agree that the defendant entered or remained in a building and not, say, a boat. But if the element is entering or remaining within one of a list of places specified in the statute (say, building, boat, vehicle, tent), then entering or remaining in a building is simply a means. Jurors do not need to agree on the means by which an offense is committed, and therefore whether a defendant illegally entered a building or a boat would not matter for purposes of obtaining a conviction.

In the real world, there are not many cases in which the state courts are required to decide whether jurors in a burglary case must agree on the building vs. boat issue, so the question whether buildings and boats are elements or means does not often arise. As a result, state-court cases on the question are rare. The Government has surveyed all the state burglary statutes and has found only one — Iowa, the State in which petitioner was convicted for burglary — in which the status of the places covered as elements or means is revealed. See Brief for United States 43, and n. 13. Petitioner's attorneys have not cited a similar decision from any other State.

How, then, are federal judges sentencing under ACCA to make the element/means determination? The Court writes: "This threshold inquiry — elements or means? — is easy in this case, as it will be in many others." Ante, at 2256. Really?3 The determination is easy in this case only because the fortified legal team that took over petitioner's representation after this Court granted review found an Iowa case on point, but this discovery does not seem to have been made until the preparation of the brief filed in this Court. Brief for United States 43, and n. 13. "Petitioner's belated identification of a relevant state decision confirms that the task is not an easy one." Ibid. And that is not the worst of it. Although many States have burglary statutes like Iowa's that apply to the burglary of places other than a building, neither the Government nor petitioner has found a single case in any of these jurisdictions resolving the question whether the place burglarized is an element or a means.

The Court assures the federal district judges who must apply ACCA that they do not need such state-court decisions, that it will be easy for federal judges to predict how state courts would resolve this question if it was ever presented to them. Ante, at 2256-2257. But the Court has not shown how this can be done. The Government's brief cites numerous state statutes like Iowa's. Brief for United States 42, n. 12. If this task is so easy, let the Court pick a few of those States and give the lower court judges a demonstration.

Picking up an argument tossed off by Judge Kozinski, the Court argues that a federal sentencing judge can get a sense of whether the places covered by a state burglary statute are separate elements or means by examining the charging document. Ante, at 2256-2257 (citing Rendon, supra, at 473-474 (Kozinski, J., dissenting from denial of reh'g en banc)). If, for example, the charging document alleges that the defendant burglarized a house, that is a clue, according to the Court, that "house" is an element. See ibid. I pointed out the problem with this argument in Descamps. See 570 U.S., at ___-___, 133 S.Ct., at 2301-2302 (dissenting opinion). State rules and practices regarding the wording of charging documents differ, and just because something is specifically alleged in such a document, it does not follow that this item is an element and not just a means. See ibid.

The present case illustrates my point. Petitioner has five prior burglary convictions in Iowa. In Iowa, the places covered are "means." See ante, at 2254. Yet the charging documents in all these cases set out the specific places that petitioner burglarized — a "house and garage," a "garage," a "machine shed," and a "storage shed." See Brief for Petitioner 9.

A real-world approach would avoid the mess that today's decision will produce. Allow a sentencing court to take a look at the record in the earlier case to see if the place that was burglarized was a building or something else. If the record is lost or inconclusive, the court could refuse to count the conviction. But where it is perfectly clear that a building was burglarized, count the conviction.

The majority disdains such practicality, and as a result it refuses to allow a burglary conviction to be counted even when the record makes it clear beyond any possible doubt that the defendant committed generic burglary. Consider this hypothetical case. Suppose that a defendant wishes to plead guilty to burglary, and the following occurs in open court on the record at the time of the plea:

As the Court sees things, none of this would be enough. Real-world facts are irrelevant. For aficionados of pointless formalism, today's decision is a wonder, the veritable ne plus ultra of the genre.4

Along the way from Taylor to the present case, there have been signs that the Court was off course and opportunities to alter its course. Now the Court has reached the legal equivalent of Ms. Moreau's Zagreb. But the Court, unlike Ms. Moreau, is determined to stay the course and continue on, traveling even further away from the intended destination. Who knows when, if ever, the Court will call home.