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 The convention probably foresaw, what it has been a principal aim of these papers to inculcate, that the danger which most threatens our political welfare, is, that the state governments will finally sap the foundations of the union; and might therefore think it necessary, in so cardinal a point, to leave nothing to construction. Whatever may have been the inducement to it, the wisdom of the precaution is evident from the cry which has been raised against it; as that very cry betrays a disposition to question the great and essential truth which it is manifestly the object of that provision to declare.

But it may be again asked, who is to judge of the necessity and propriety of the laws to be passed for executing the powers of the union? I answer, first, that this question arises as well and as fully upon the simple grant of those powers, as upon the declaratory clause: and I answer, in the second place, that the national government, like every other, must judge, in the first instance, of the proper exercise of its powers; and its constituents in the last. If the federal government should overpass the just bounds of its authority, and make a tyrannical use of its powers; the people, whose creature it is, must appeal to the standard they have formed, and take such measures to redress the injury done to the constitution, as the exigency may suggest and prudence justify. The propriety of a law, in a constitutional light, must always be determined by the nature of the powers upon which it is founded. Suppose, by some forced construction of its authority (which indeed cannot easily be imagined) the federal legislature should attempt to vary the law of descent in any state; would it not be evident, that in making such an attempt, it had exceeded its jurisdiction, and infringed upon that of the state? Suppose, again, that upon the pretence of an interference with its revenues, it should undertake to abrogate a land tax imposed by the authority of a state; would it not be equally evident, that this was an invasion of that concurrent jurisdiction in respect to this species of tax, which the constitution plainly supposes to exist in the state governments? If there ever should be a