Which Plains peoples served as middlemen in the horse trade?

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The Cheyenne served as middlemen in the trade of horses between the tribes of the southern Plains and those of the north-central Plains.1

While other groups, such as the Assiniboine, Hidatsa, Mandan, Sahnish, and certain Oceti Sakowin groups, were also active as middlemen, their trade primarily involved brokering guns and other European-manufactured materials like blankets, beads, cloth, and kettles in exchange for pelts and buffalo robes.1