The Constitution provides that "no State shall, without the consent of Congress, lay any duty of tonnage." With the "consent" of Congress, such duties may be levied, collected, and expended by the States. We are not left in the dark as to the objects of this reservation of power to the States. The subject was fully considered by the Convention that framed the Constitution. It appears in Mr. Madison's report of the proceedings of that body that one object of the reservation was that the States should not be restrained from laying duties of tonnage for the purpose of clearing harbors. Other objects were named in the debates, and among them the support of seamen. Mr. Madison, treating on this subject in the Federalist, declares that—
The restraint on the power of the States over imports and exports is enforced by all the arguments which prove the necessity of submitting the regulation of trade to the Federal councils. It is needless, therefore, to remark further on this head than that the manner in which the restraint is qualified seems well calculated at once to secure to the States a reasonable discretion in providing for the conveniency of their imports and exports, and to the United States a reasonable check against the abuse of this discretion.
The States may lay tonnage duties for clearing harbors, improving rivers, or for other purposes, but are restrained from abusing the power, because before such duties can take effect the "consent" of Congress must be obtained. Here is a safe provision for the improvement of harbors and rivers in the reserved powers of the States and in the aid they may derive from duties of tonnage levied with the consent of Congress. Its safeguards are, that both the State legislatures and Congress have to concur in the act of raising the funds; that they are in every instance to be levied upon the commerce of those ports which are to profit by the proposed improvement; that no question of conflicting power or jurisdiction is involved; that the expenditure, being in the hands of those who are to pay the money and be immediately benefited, will be more carefully managed and more productive of good than if the funds were drawn from the National Treasury and disbursed by the officers of the General Government; that such a system will carry with it no enlargement of Federal power and patronage, and leave the States to be the sole judges of their own wants and interests, with only a conservative negative in Congress upon any abuse of the power which the States may attempt.
Under this wise system the improvement of harbors and rivers was commenced, or rather continued, from the organization of the Government under the present Constitution. Many acts were passed by the several States levying duties of tonnage, and many were passed by Congress giving their consent to those acts. Such acts have been passed by Massachusetts, Rhode Island, Pennsylvania, Maryland, Virginia, North Carolina, South Carolina, and Georgia, and have been sanctioned by the consent of Congress. Without enumerating them all, it may be instructive to refer to some of them, as illustrative of the mode of improving harbors and rivers in the early periods of our Government, as to the constitutionality of which there can be no doubt.
In January, 1790, the State of Rhode Island passed a law levying a tonnage duty on vessels arriving in the port of Providence, "for the purpose of clearing and deepening the channel of Providence River and making the same more navigable."
On the 2d of February, 1798, the State of Massachusetts passed a law levying a tonnage duty on all vessels, whether employed in the foreign or coasting trade, which might enter into the Kennebunk River, for the improvement of the same by "rendering the passage in and out of said river less difficult and dangerous."
On the 1st of April, 1805, the State of Pennsylvania passed a law levying a tonnage duty on vessels, "to remove the obstructions to the navigation of the river Delaware below the city of Philadelphia."
On the 23d of January, 1804, the State of Virginia passed a law levying a tonnage duty on vessels, "for improving the navigation of James River."
On the 22d of February, 1826, the State of Virginia passed a law levying a tonnage duty on vessels, "for improving the navigation of James River from Warwick to Rocketts landing."
On the 8th of December, 1824, the State of Virginia passed a law levying a tonnage duty on vessels, "for improving the navigation of Appomattox River from Pocahontas Bridge to Broadway."