ROOTS OF POLITICAL SOCIETY
The principle was a natural consequence upon the nomadic life of families and tribes, of primitive groups wandering often in strange and even hostile territory, to whom in absence of fixed abode and boundaries locality was of little importance, but tribal solidarity and unity of purpose and allegiance were vital to defense, to group survival. The family, and after it the clan or group of blood-related families, were the beginnings of political society.
Throughout ancient times the Law of the Blood persisted; the law of citizenship in early Greece and Rome was based upon the idea of family inheritance. But with the dissolution of the Roman Empire and the rise of feudalism, the Jus Sanguinis gradually gave way to a standard of citizenship based upon locality—to Jus Solis, under which a child became ipso facto a citizen or subject of the jurisdiction within which he was born, more or less regardless of the nationality or allegiance of his parents. This was a natural concomitant of feudalism; as the conflicts between military chieftains and groups divided the land into relatively definite jurisdictions, and the tenure of territory and the stability of boundaries and peace in the realm depended almost wholly upon military strength, it was to the interest of both lord and vassal to maintain the largest possible forces for defense, and conservation of population depended chiefly upon birth. Even to the peasant subject, maintenance of almost any status quo was comparatively worth while for the sake of the peaceful enjoyment of such home and happiness as were his lot.