The missisipi river formed western boundary
The Cheyenne were intermediaries in the commerce of horses between the tribal groups of the southern Plains and those of the north-central Plains.
Trade between tribes like Cheyenne of the Plains frequently consisted of exchanging hunting-related goods for agricultural goods like corn and squash. After the seventeenth century, European and American commodities including horses, weapons, and other metal goods were incorporated into the preexisting Plains commerce system. The Assiniboin, Hidatsa, Mandan, Arikara, and later some eastern Sioux groups mediated the trade of guns and other items like bedding, beads, fabric, and kettles that came from the British and French for pelts and buffalo robes from clusters to the west.
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After segregation black people began to have the same rights as whites, not being separated by the color of their skins. Today, they can attend the same places as white people and theoretically have the same oputurnidades, since after segregation it was decided that we are all equal regardless of color
However, the prejudice remains the same and this minority continues to be discriminated by its color. This may be noted, when it is observed that blacks are still largely the poor and criminalized population, are the minority in universities, and there are few examples of blacks as executive leaders.