the supremacy clause is the common name given to article vi, clause 2 of the united states constitution, which reads:
"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."
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the united states was never yet made. they were still the colonials. and the colonials fought the monarchy of great britain.