The principal purposes to be answered by union are these the common defense of the members; the preservation of the public peace as well against internal convulsions as external attacks; the regulation of commerce with other nations and between the States; the superintendence of our intercourse, political and commercial, with foreign countries.
Alexander HamiltonIf the end be clearly comprehended within any of the specified powers, and if the measure have an obvious relation to that end, and is not forbidden by any particular provision of the Constitution, it may safely be deemed to come within the compass of the national authority.
Alexander HamiltonLet experience, the least fallible guide of human opinion, be appealed to for an answer to these inquiries.
Alexander Hamilton