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From these studies it would seem that civilizations pass through a process of evolution which can be analyzed briefly as follows: each civilization is born in some inexplicable fashion and, after a slow start, enters a period of vigorous expansion, increasing its size and power, both internally and at the expense of its neighbors, until gradually a crisis of organization appears. When this crisis has passed and the civilization has been reorganized, it seems somewhat different. Its vigor and morale have weakened. It becomes stabilized and eventually stagnant. After a Golden Age of peace and prosperity, internal crises again arise. At this point there appears, for the first time, a moral and physical weakness which raises, also for the first time, questions about the civilizationβs ability to defend itself against external enemies. Racked by internal struggles of a social and constitutional character, weakened by loss of faith in its older ideologies and by the challenge of newer ideas incompatible with its past nature, the civilization grows steadily weaker until it is submerged by outside enemies, and eventually disappears.
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