Naturally, an empire is compatible with any kind of an administrative service among both governors and governed. The suzerain may attend to its affairs with the aid of professional and specially trained officials, as in a bureaucracy; and a vassal may entrust the details of its public business to successive fractions of its citizens, as in some republics: no imperial relation is established unless separate states or parts of states are involved. But when these are related in a whole as superiors and inferiors, an empire at once arises. The relation of inferiority and superiority is, however, essential in any empire. In modern times this is acknowledged with the utmost frankness. Upon the higher capacity for government claimed by the Christian peoples, the Western cultures, or the Anglo-Saxons, as the case may be, modern pride, greed, or conscience bases its right to control inferior races. "Take up the white man's burden" is the modern substitute for the ancient commandment, "Go ye into all the world and preach the Gospel to every creature." The possession of a better rule of public life imposes--it is affirmed--a missionary obligation no less weighty than the possession of a special rule of eternal life. Less exasperating, perhaps, than this assumption of moral and political superiority is the candid profession of the right of the stronger. The right of conquest gives a title which is valid in international law when every other right is lacking. When superiority is stipulated to be absent, the product is a federation or something similar from which the name empire is withheld. When, in course of time, superiority dies out till a common right eventually embraces subject and sovereign alike, a new state arises, to which, as in the case of the present-day British world, the title empire is applied with some impropriety.