Key points are not available for this paper at this time.
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.
Karl W. Deutsch (Thu,) studied this question.