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it is still well marked in the economic of these very distinct yet very monotonous little units-

When we look at a map, we see that such regions do in fact exist; they are found, as we should have expected, a priori just on the borderland of differing natural formations (steppes and savannahs, savannahs and intertropical forests), and at the meeting-points of these formations. This happened in Asia, where the belt bordering on the steppes forms a veritable centre of political activity; this region witnessed those continual oscillations in power between the nomads and the settled tribes, which we described a little farther back.