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Quotation from Gibbons v. Ogden by Supreme Court 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 in the exercise of powers not controverted, must yield to it.”
Gibbons v. Ogden, Opinion of the Court (Marshall, C.J.), on conflict with the act of Congress (U.S. Reports text (Wikisource))

Marshall states the rule of federal supremacy that decides the case.
Citation: "In every such case, the act of Congress or the treaty is supreme, and the law of the State, though enacted in the exercise of powers not controverted, must yield to it." — Supreme Court of the United States, Gibbons v. Ogden, Opinion of the Court (Marshall, C.J.), on conflict with the act of Congress (U.S. Reports text (Wikisource)). (id gibbons-v-ogden-q5)
Portrait: John Marshall by Henry Inman, 1832, Henry Inman, Public domain.
