Describe the geographical conditions that set the stage for North American history..?

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Describe the origin and development of the major indian cultures of the americans..
Thank you for the help.

The American West - Native Americans (http://www.americanwest.com/pages/indians.htm)

The major ones I can think of off the top of my head are

Western: Sioux, Navajo, Hopi, Blackfoot, Pawnee,
Eastern: Cherokee, Apache, Algonquin, Chippewa

Cheyenne, Iroquois,

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