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The development of Lewis Henry Morgan's evolutionism.

Lewis Henry Morgan never used the term evolution in any of his major sociological works. If he may be labeled an evolutionist, the specificity of his views must be taken into account. The main "evolutionist" issue that concerned him was that of the unity or diversity of the human species. This was an urgent political and theological issue in the America of his day, and it impinged also on research on the American Indians. Morgan's first major study was designed to demonstrate the unity of origin of the American aborigines and their "Asian" origins. His methods were derived from the tradition of Indo-European philology. It was virtually as an afterthought that he added a social evolutionary component to what he conceived of as an exercise in philology. Later he came under the direct influence of the English evolutionists, and this was crucial for the conception of Ancient Society.