"The powers of the federal government are enumerated; it can only operate in certain cases; it has legislative powers on defined and limited objects, beyond which it cannot extend its jurisdiction."-- James Madison
Alexander Hamilton: “The only qualification of the generallity of the Phrase in question, which seems to be admissible, is this—That the object to which an appropriation of money is to be made be General and not local; its operation extending in fact, or by possibility, throughout the Union, and not being confined to a particular spot.”