The constitutional clause that is common to both Hammer v. Dagenhart (1918) and United States v. Lopez (1995) is the Commerce Clause.
The case titled "Hammer v. Dagenhart" was a United States Supreme Court decision in which the Court struck down a federal law regulating child labor. The case decision was overruled by the case of United States v. Darby Lumber Co. Here, the Supreme Court held that the Commerce Clause does not grant the power to regulate commerce of interstate commerce of goods produced with child labor.
The case titled "United States v. Alfonso D. Lopez" was a United States Supreme Court decision concerning the Commerce Clause, it was the first case since 1937 in which the Court held that Congress had exceeded its power to legislate under the Commerce Clause.
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