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In page Native Americans in the United States:

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At the time of the first contact, the Indigenous cultures were different from those of the proto-industrial and mostly Christian immigrants. Some Northeastern and Southwestern cultures, in particular, were matrilineal and they were organized and operated on a more collective basis than the culture which Europeans were familiar with. Most Indigenous American tribes treated their hunting grounds and agricultural lands as land that could be used by their entire tribe. Europeans had developed concepts of individual property rights with respect to land that were extremely different. The differences in cultures, as well as the shifting alliances among different nations during periods of warfare, caused extensive political tension, ethnic violence, and social disruption.[citation needed]