Nor can I see any genuine alternative in what some advocate--reliance by each nation on its own military strength as the sole effective guarantee for its interests. After the military lessons of this war, the concentration of scientific, economic, and even educational attention upon military purposes would almost inevitably be vastly in excess of anything previously conceived. What limits can be set to the armies of France and Great Britain if these are to protect those countries from a German empire already double its previous extent, and taking steps to control the resources of eastern Europe and the near East? What navy could guarantee German commerce against the combined forces of Great Britain and the United States? What limits to the frightfulness yet to be discovered by chemist and bacteriologist? What guarantee against the insidious growth of a militarist attitude even in democratically minded peoples if the constant terror of war exalts military preparations to the supreme place? Something has changed the Germany of other days which many of us loved even while we shrank from its militarist masters. Is it absolutely certain that nothing can change the spirit of democratic peoples? At any rate, America, which has experimented on a larger scale with coöperation--political, economic, and religious--than any other continent, may well assert steadily and insistently that this is the more hopeful path. It may urge this upon distrustful Europe. The obstacles to coöperation are: 1. The survival of the principle of dominance, showing itself in desire for political power and prestige, and in certain conceptions of national honor. 2. The principle of non-social competition, exhibited in part in the political policy of eliminating weaker peoples, and conspicuously in foreign trade when the use of unfair methods relies upon national power to back up its exploitation or monopoly. 3. The principle of nationalistic sentiment, itself based on coöperation, on social tradition and common ideals, but bound up so closely with political sovereignty and antagonisms as to become exclusive instead of coöperative in its attitude toward other cultures.