and an AFFIRMANCE of another; a negation of the authority of the States to impose taxes on imports and exports, and an affirmance of their authority to impose them on all other articles. It would be mere sophistry to argue that it was meant to exclude them ABSOLUTELY from the imposition of taxes of the former kind, and to leave them at liberty to lay others SUBJECT TO THE CONTROL of the national legislature. The restraining or prohibitory clause only says, that they shall not, WITHOUT THE CONSENT OF CONGRESS, lay such duties; and if we are to understand this in the sense last mentioned, the Constitution would then be made to introduce a formal provision for the sake of a very absurd conclusion; which is, that the States, WITH THE CONSENT of the national legislature, might tax imports and exports; and that they might tax every other article, UNLESS CONTROLLED by the same body. If this was the intention, why not leave it, in the first instance, to what is alleged to be the natural operation of the original clause, conferring a general power of taxation upon the Union? It is evident that this could not have been the intention, and that it will not bear a construction of the kind.
As to a supposition of repugnancy between the power of taxation in the States and in the Union, it cannot be supported in that sense which would be requisite to work an exclusion of the States. It is, indeed, possible that a tax might be laid on a particular article by a State which might render it INEXPEDIENT that thus a further tax should be laid on the same article by the Union; but it would not imply a constitutional inability to impose a further tax. The quantity of the imposition, the expediency or inexpediency of an increase on either side, would be mutually questions of prudence; but there would be involved no direct contradiction of power. The particular policy of the national and of the State systems of finance might now and then not exactly coincide, and might require reciprocal forbearances. It is not, however a mere possibility of inconvenience in the exercise of powers, but an immediate constitutional repugnancy that can by implication alienate and extinguish a pre-existing right of sovereignty.