Primitive tribal life had elements of each of the three principles we have named. But with discovery by some genius of the power of organization for war the principle of dominance won, seemingly at a flash, a decisive position. No power of steam or lightning has been so spectacular and wide-reaching as the power which Egyptian, Assyrian, Macedonian, Roman, and their modern successors introduced and controlled. Political states owing their rise to military means naturally followed the military pattern. The sharp separation between ruler or ruling group and subject people, based on conquest, was perpetuated in class distinction. Gentry and simple, lord and villein, were indeed combined in exploitation of earth's resources, but coöperation was in the background, mastery in the fore. And when empires included peoples of various races and cultural advance the separation between higher and lower became intensified. Yet though submerged for long periods, the principle of coöperation has asserted itself, step by step and it seldom loses ground. Beginning usually in some group which at first combined to resist dominance, it has made its way through such stages as equality before the law, abolition of special privileges, extension of suffrage, influence of public sentiment, interchange of ideas, toward genuine participation by all in the dignity and responsibility of political power. It builds a Panama Canal, it maintains a great system of education, and has, we may easily believe, yet greater tasks in prospect. It may be premature to predict its complete displacement of dominance in our own day as a method of government, yet who in America doubts its ultimate prevalence?