Mathis v. United States, 579 U.S. ___ (2016), was a United States Supreme Court case in which the Court held that if a state law defines a crime more broadly than the common understanding of that crime, a conviction under that state law cannot be used as a sentencing enhancement under the federal Armed Career Criminal Act.

[1][2] The conviction at issue was under Iowa's burglary law, which criminalized unlawful entry into "any building, structure, [or] land, water, or air vehicle."

To the Court, the common understanding of "burglary" was unlawful entry into a "building or other structure.

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