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At many places and times, tribes have merged to form peoples; and peoples have grown into nations. Some nations founded empires; and empires have broken up again into fragments whose populations later attempted again to form larger units. In certain respects, this sequence appears to describe a general process found in much of history. This process shows a number of patterns which seem to recur, and which to a limited extent seem to be comparable among different regions, periods, and cultures.
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Karl W. Deutsch (1953) studied this question.
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