@Cyracuz,
Those 19th century theorists tried to apply Darwin's strictly biological principles to a description of the evolution of societies, or socio-cultural systems, in terms of stages and progress--a gross misapplication of Darwin if you ask me. The lowest stage of socio-cultural "evolution" was, as I recall, Savagery, then Barbarism and then Civilization. Various criteria varied with different theorists, but I think categories like animal and plant domestication, the use of bow and arrow and spear throwers, metal and writing were common. Another version ranked societies in terms of the political levels of "bands" (nomadic hunters and gatherers), tribes (acephalic sedentary agriculturalists), chiefdoms (cephalic agriculturalists) and states (with kings, constitutions, and the like).
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