Chalmers Johnson in The Sorrows of Empire:

"The only truly common elements in the totality of America's foreign bases are imperialism and militarism--an impulse on the part of our elites to dominate other peoples largely because we have the power to do so, followed by the strategic reasoning that, in order to defend these newly acquired outposts and control the regions they are in, we must expand the areas under our control with still more bases. To maintain its empire, the Pentagon must constantly invent new reasons for keeping in our hands as many bases as possible long after the wars and crises that led to their creation have evaporated."

By James Madison, primary author of the Constitution:

"Of all enemies to public liberty, war is, perhaps, the most to be dreaded, because it comprises and develops the germ of every other. War is the parent of armies; from these proceed debt and taxes; and armies, and debts, and taxes are the known instruments for bringing the many under the domination of the few."