Summary

Samuel Nelson Sinnot v. Davenport — Opinion of the Court

Taking the term commerce in its broadest acceptation, supposing it to embrace not merely traffic, but the means and vehicles by which it is prosecuted, can it properly be made to include objects and purposes such as those contemplated by the law under review? Commerce with foreign nations must signify commerce, which in some sense is necessarily connected with those nations, transactions which, either immediately or at some stage of their progress, must be extra territorial.
Source: Wikisource

Samuel Nelson Sinnot v. Davenport — Opinion of the Court

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 supremacy 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.
Source: Wikisource

Samuel Nelson Sinnot v. Davenport — Opinion of the Court

Neither is the law partial; it acts alike on all, and is for the benefit and protection of all.
The act, therefore, being for the purpose of carrying out and rendering effectual the undisputed police regulations of the State, is itself of the same police character, admitted, by undisputed authority, to be within the power of the States.
The coasting license authorizes the navigation of the waters, and the carrying on of trade and commerce within the States but it does not pretend to authorize a disregard of the police laws passed by the States for the observance of its own citizens.
Source: Wikisource

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