Republican Isolationists refused to ratify President Wilson's League of Nations after World War I because they feared it would draw the United States into future European conflicts. At the end of World War I, the US was only just begin to depart from its previous policy of foreign affairs, which was isolationism - staying out of other countries' affairs. The Isolationists feared that tethering the United States to the League of Nations would result in the US being required to come to the aid of an invaded European state at a later date.
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Scientists who compared the skulls and DNA of human remains from around the world say their results point to modern humans (Homo sapiens) having a single origin in Africa.
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Features such as migration of people, invasions, population distribution, and deurbanization characterized this period. The medieval ages had three periods, which include the antiquity, the medieval periods, and the modern period, all of which exhibited different characteristics.
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