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Quotation from Gibbons v. Ogden by Supreme Court of the United States
“Commerce among the States cannot stop at the external boundary line of each State, but may be introduced into the interior.”
Gibbons v. Ogden, Opinion of the Court (Marshall, C.J.), on commerce among the several states (U.S. Reports text (Wikisource))

Marshall explains why federal power over interstate commerce reaches within state borders.
Citation: "Commerce among the States cannot stop at the external boundary line of each State, but may be introduced into the interior." — Supreme Court of the United States, Gibbons v. Ogden, Opinion of the Court (Marshall, C.J.), on commerce among the several states (U.S. Reports text (Wikisource)). (id gibbons-v-ogden-q3)
Portrait: John Marshall by Henry Inman, 1832, Henry Inman, Public domain.
