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In page Native Americans in the United States:

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Ethnographers classify the Indigenous peoples of North America into ten cultural areas inhabited by groups who share certain cultural traits:[citation needed] the Arctic, Subarctic, Northeastern Woodlands, Southeastern Woodlands, Great Plains, Great Basin, Northwest Plateau, Northwest Coast, California, and Southwest (Oasisamerica). At the time of the first contact, Indigenous cultures varied widely, with some Northeastern and Southwestern groups being matrilineal and organized on collective bases unfamiliar to Europeans. Land was typically held communally, in contrast to European property rights traditions. These differences, compounded by shifting alliances and warfare, generated political tension, ethnic violence, and disruption.[citation needed]