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The Supremacy Clauses and the Hierarchy of Laws
1. The Supremacy Clause [in the United States Constitution] establishes that federal law “shall be the supreme Law of the Land ... any Thing in the Constitution or Laws of any State to the Contrary notwithstanding.” U.S. Const., Art. VI, cl. 2. Where state and federal law “directly conflict,” state law must give way. Wyeth, supra, at 583, 129 S.Ct. 1187 (THOMAS, J., concurring in judgment); see also *618 Crosby v. National Foreign Trade Council, 530 U.S. 363, 372, 120 S.Ct. 2288, 147 L.Ed.2d 352 (2000) (“[S]tate law is naturally preempted to the extent of any conflict with a federal statute”). We have held that state and federal law conflict where it is “impossible for a private party to comply with both state and federal requirements.”4 Freightliner Corp. v. Myrick, 514 U.S. 280, 287, 115 S.Ct. 1483, 131 L.Ed.2d 385 (1995) (internal quotation marks omitted).5
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