which should be preferred, and how far either should be made subservient to the other.
These cases illustrate the general doctrine, now fully recognized, that the commercial power of Congress is exclusive of State authority only when the subjects upon which it is exerted are national in their character and admit and require uniformity of regulations affecting alike all the States; and that when the subjects within that power are local in their nature or operation, or constitute mere aids to commerce, the States may pror vide for their regulation and management, until Congress intervenes and supersedes their action.
The complainant, however, contends that Congress has intervened and expressed its will on this subject by a clause in the act of September 9, 1850, 9 Stat. 452, admitting California as a State into the Union, which declares- “ that all the navigable waters within the'said State shall be common highways and forever free, as well to the inhabitants of said State as to the citizens of the United States, without any tax, impost, or duty therefor.” 9. Stat. 453. This declaration is similar to that contained in the ordinance of 1787. for the government of the territory of the United States northwest of- the Ohio River, so far as the' latter .relates to the navigable waters flowing into the Mississippi and the St. Lawrence. And in Escanaba, Co. v. Chicago we held, with respect to. the State of Illinois,' that the clause was superseded by her admission into the Union, for she then became entitled to, and possessed of all the rights of domain and sovereignty which belonged to the original States. The language of the resolution admitting her declared, that it was on “ an equal footing with the original States in all respects whatever; ” so that, after her admission, she possessed the same power over rivers within her limits that Delaware exercised over Blackbird Creek and Pennsylvania over Schuylkill River.
The act enabling the people of Wisconsin Territory to form a Constitution and State government, and for admission into the Union, contains a similar clause. And yet, in Pound v. Turck, which was before this court at October Term, 1877, it was held', that a statute of that State which authorized the