Justice BREYER delivered the opinion of the Court.Syllabus
The Armed Career Criminal Act (Act) imposes a special mandatory 15–year prison term upon a felon who unlawfully possesses a firearm and who has three or more prior convictions for committing certain drug crimes or “a violent felony.” 18 U.S.C. § 924(e)(1). The Act defines “violent felony” as, inter alia, a crime punishable by more than one year's imprisonment that “is burglary, arson, or extortion, involves use of explosives, or otherwise involves conduct that presents a serious potential risk of physical injury to another.” § 924(e)(2)(B)(ii) (hereinafter clause (ii)). After petitioner Begay pleaded guilty to felony possession of a firearm, his presentence report revealed he had 12 New Mexico convictions for driving under the influence of alcohol (DUI), which state law makes a felony (punishable by a prison term of more than one year) the fourth (or subsequent) time an individual commits it. Based on these convictions, the sentencing judge concluded that Begay had three or more “violent felony” convictions and, therefore, sentenced him to an enhanced 15–year sentence. The Tenth Circuit rejected Begay's claim that DUI is not a “violent felony” under the Act.