So it is with us in the larger question of that general civilization which is common to both Americans and Europeans, and which in its vigor has extended garrisons, as it were, into Asia and Africa. We cannot understand it today unless we understand what it developed from. What was the origin from which we sprang? What was the Roman Empire? The Roman Empire was a united civilization, the prime characteristic of which was the acceptation, absolute and unconditional, of one common mode of life by all those who dwelt within its boundaries. It is an idea very difficult for the modern man to seize, accustomed as he is to a number of sovereign countries more or less sharply differentiated, and each separately colored, as it were, by different customs, a different language, and often a different religion. Thus the modern man sees France, French speaking, with an architecture, manners, laws of its own, etc.; he saw (till yesterday) North Germany under the Prussian hegemony, German speaking, with yet another set of institutions, and so forth. When he thinks, therefore, of any great conflict of opinion, such as the discussion between aristocracy and democracy today, he thinks in terms of different countries. Ireland, for instance, is Democratic, England is Aristocratic—and so forth. Again, the modern man thinks of a community, however united, as something bounded by, and in contrast with, other communities. When he writes or thinks of France he does not think of France only, but of the points in which France contrasts with England, North Germany, South Germany, Italy, etc. Now the men living in the Roman Empire regarded civic life in a totally different way. All conceivable antagonisms (and they were violent) were antagonisms _within one State_. No differentiation of State against State was conceivable or was attempted. From the Euphrates to the Scottish Highlands, from the North Sea to the Sahara and the Middle Nile, all was one State. The world outside the Roman Empire was, in the eyes of the Imperial citizen, a sort of waste. It was not thickly populated, it had no appreciable arts or sciences, it was _barbaric_. That outside waste of sparse and very inferior tribes was something of a menace upon the frontiers, or, to speak more accurately, something of an irritation. But that menace or irritation was never conceived of as we conceive of the menace of a foreign power. It was merely the trouble of preventing a fringe of imperfect, predatory, and small barbaric communities outside the boundaries from doing harm to a vast, rich, thickly populated, and highly organized State within.