Supremacy of the Constitution, Laws and Treaties

Article 6 - Prior Debts, National Supremacy, Oaths of Office
Section 0
Clause 2

This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding.