The Aboriginal Americans reference article from the English Wikipedia on 24-Jul-2004
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Aboriginal Americans

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Aboriginal Americans (or alternatively, American Aborigines) is a term that is used to describe the various peoples to first inhabit the area of the Americas. The more commonly used terms for these people are Native Americans and American Indians.

See "Native American" for a detailed description of the various nations/tribes of indigenous peoples to the Americas, and other terms that attempt to denote the same.