When projected to a larger screen, however, its basic truth becomes transparent. Homo erectus wandered out of Africa, the ancestors of Native Americans moved out of Asia, and Anglo-Saxons shipped out from Europe. The formation of the United States was one of many fruits of the migratory impulse. The consequence of migration is a constant grouping and regrouping of human beings. Sometimes groups blend together or a stronger one assimilates a weaker one, and sometimes groups split up and diversify.
Social evolution is as dynamic as biological evolution.
Many believe, however, that their own migration or that of their forebears was the last one, marking the end of history. The occupied territory then becomes an endowed part of the self. Meanwhile, however, human migration continues. Other folks are on the move, pressing into the same territory, first into the country, then into the neighborhood. Perceptions differ, of course.