There is, indeed, such a thing as a “man without a country,” and it is only a few years since the United States, even if inadvertently, legislated so that there may easily be now a woman without one. But the laws of nations make no provisions for the existence voluntarily of anyone who may regard himself as “a citizen of the world.” With the vanishment of _terra incognita_ in the final achievement of human exploration at the two poles of the earth, virtually every foot of the surface of the globe has come, at least constructively, under the dominion of some government. And with it every man, woman, and child on earth has acquired or had thrust upon him a legal nationality of some sort, from which, generally speaking, he can escape only by choosing or having thrust upon him another--however feeble or tenuous its grasp, however slight or contemptuous his perception and recognition of it. The Great War emphatically registered this fact, with its ruthless inclusion of friend, neutral, and foe within some category of practicable citizenship. In the United States the Selective Service Act, and other legislation as well--to say nothing of the extra-legal practices indulged in under cover of the popular state of mind--permitted no human being to regard himself as immune to effective classification under some sovereignty. The “conscientious objector,” the “philosophical anarchist,” and every sort of philosopher, however much he previously may have imagined himself free to abjure allegiance to government, found that his property, his food, his sons, his own very personal flesh-and-blood, were, after all, not his own, but were subject to conscription by the state. However much his spirit might be of fellowship with the saints of his cult or religion, in all material respects he must render unto Cæsar the things that Cæsar said were Cæsar’s. From the most primitive times this has been so, even if in the America of the happy-go-lucky times of peace it has been lightly regarded or scarcely realized at all. The “gang spirit,” under the sway of which men always have held loyalty to the local clan to be one of the chief of obligatory virtues, is of the essence and fabric of group life, and is the tap-root of patriotism. It embodies an allegiance both to blood and to locality. Through the warp of all political history are woven two kindred threads representing these two allegiances; sometimes one, sometimes the other--in later development something of both. The lawyers speak of them as the _Jus Sanguinis_, the Law of the Blood, and the _Jus Solis_, the Law of the Soil, and distinguish between them; but both represent the claim of the community upon the loyalty and, if need be, the sacrifice and bodily service of the individual.