At the same time that Evolution is a change from the homogeneous to the heterogeneous, it is a change from the indefinite to the definite. Development, no matter of what kind, exhibits not only a multiplication of unlike parts, but an increase in the clearness with which these parts are marked off from one another. . . . The successive phases through which societies pass, obviously display the progress from indeterminate arrangements to determinate arrangements. A wandering tribe of savages, being fixed neither in its locality nor in its internal distribution, is far less definite in the relative positions of its parts than a nation. In such a tribe the social relations are confused and unsettled.
Political authority is vague.
Distinctions of rank are neither clearly marked nor impassable. And save in the different occupations of men and women, there are no decided industrial divisions. Only in tribes of considerable size, which have enslaved other tribes, is economic differentiation distinct. But one of these primitive societies that evolves, becomes step by step more specific. Increasing in size, consequently ceasing to be so nomadic, and restricted in its range by neighbouring societies, it acquires, after prolonged border warfare, a settled territorial boundary.