Extend the sphere and you take in a greater variety of parties and interests; you make it less probable that a majority of the whole will have common motive to invade the rights of other citizens.
James MadisonThe powers delegated by the proposed Constitution to the federal government are few and defined. Those which are to remain in the State governments are numerous and indefinite. The former will be exercised principally on external objects, as war, peace, negotiation and foreign commerce. ... The powers reserved to the several States will extend to all the objects which in the ordinary course of affairs, concern the lives and liberties, and properties of the people, and the internal order, improvement and prosperity of the State.
James MadisonThe ultimate authority resides in the people, and that if the federal government got too powerful and overstepped its authority, then the people would develop plans of resistance and resort to arms.
James MadisonFor the same reason that the members of the State legislatures will be unlikely to attach themselves sufficiently to national objects, the members of the federal legislature will be likely to attach themselves too much to local objects.
James MadisonThe Constitution expressly and exclusively vests in the Legislature the power of declaring a state of war [and] the power of raising armies.... A delegation of such powers [to the President] would have struck, not only at the fabric of our Constitution, but at the foundation of all well organized and well checked governments. The separation of the power of declaring war from that of conducting it, is wisely contrived to exclude the danger of its being declared for the sake of its being conducted.
James Madison