Gibbons v. Ogden · ¶64

But the framers of our constitution foresaw this ' state of things, and provided for it, by declaring the supremacy not only of itself, but of the laws inade in pursuance of it. The nullity of any act, inconsistent with the constitution, is produced by the declaration, that the constitution is" the supreme law. The appropriate application of that part of the clause which confers the same supre^ rnacy on laws and treaties, is to such acts of the State Legislatures as do not transcend their powers, but, though enacted in the execution of acknowledged State powers, interfere with, or are contrary to the laws of Congress, made in pursuance of the constitution, or some treaty made under the authority of the United States. In every such case, the act of Congress, or. the treaty, is supreme; and the law of the State, though enacted,i« the exercise of powers not controverted, must yield to it.

U. S. Reports, bound volume
U. S. Reports, volume 22, at 1 (Library of Congress) · transcription: Caselaw Access Project
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