You can find examples of authentic Native American Art at
Discovery Path. You can also find unique and beautiful examples of
Native American Art at Thunder Heart Drawing and Wind Spirit
Teachings.
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It is the art produced by North American Indians. Each tribe has
its own art, so you're not going to find one sort of art that's
just called North American Indian Art.
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No, while many who are Native Americans are, in fact, North
Americans, there are very many who are North Americans, but not at
all of Native American descent.