_Rome Becomes a Dominant City_.--In all of this struggle at home and abroad, foreign conquest led to the establishment of Rome as the central city. The constitution of Rome was the typical constitution for all provincial cities, and from this one centre all provinces were ruled. No example heretofore had existed of the centralization of government similar to this. The overlordship of the Persians was only for the purpose of collecting tribute; there was little attempt to carry abroad the Persian institutions or to amalgamate the conquered provinces in one great homogeneous nation. The empire of Athens was but a temporary hegemony over tributary states. But the Roman government conquered and absorbed. Wherever went the Roman arms, there the Roman laws and the Roman government followed; there followed the Roman language, architecture, art, institutions, and civilization. Great highways passed from the Eternal City to all parts of the territory, binding together the separate elements of {258} national life, and levelling down the barriers between all nations. Every colony planted by Rome in the new provinces was a type of the old Roman life, and the provincial government everywhere became the type of this central city. Here was reached a state in the development of government which no nation had hitherto attained--the dominant city and the rule of a mighty empire from central authority. _The Development of Government_.--The remarkable development of Rome in government from the old hereditary nobility, in which priest-kings ruled the people, to a military king who was leader, subsequently into a republic which stood the test for several centuries of a fierce struggle for the rights of the people, finally into an imperial government to last for 450 years, represents the growth of one of the most remarkable governments in the world's history. The fundamental idea in government was the ruling of an entire state from the central city, and out of this idea grew imperialism as a later development, vesting all authority in a single monarch. The governments of conquered provinces were gradually made over into the Roman system. The Roman municipal government was found in all the cities of the provinces, and the provincial government became an integral part of the Roman system. The provinces were under the supervision of imperial officers appointed by the emperor. Thus the tendency was to bind the whole government into one unified system, with its power and authority at Rome. So long as this central authority remained and had its full sway there was little danger of the decline of Roman power, but when disintegration began in the central government the whole structure was doomed.