Summary

by John Marshall Harlan Champion v. Ames — Opinion of the Court

If lottery traffic, carried on through interstate commerce, is a matter of which Congress may take cognizance and over which its power may be exerted, can it be possible that it must tolerate the traffic, and simply regulate the manner in which it may be carried on? Or may not Congress, for the protection of the people of all the states, and under the power to regulate interstate commerce, devise such means, within the scope of the Constitution, and not prohibited by it, as will drive that traffic out of commerce among the states?
Source: Wikisource

by John Marshall Harlan Champion v. Ames — Opinion of the Court

The law of nations, regarding man as a social animal, pronounces all commerce legitimate in a state of peace, until prohibited by positive law. The power of a sovereign state over commerce, therefore, amounts to nothing more than a power to limit and restrain it at pleasure. And since the power to prescribe the limits to its freedom necessarily implies the power to determine what shall remain unrestrained, it follows that the power must be exclusive
Source: Wikisource

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