How did competition for trade routes lead to conflict among Plains nations?

Among the Indigenous peoples of the Great Plains, competition for trade routes was a significant driver of intertribal conflict. Tribes frequently engaged in hostilities when they sought to establish or maintain sole control over specific trade routes, as these paths were essential for the exchange of goods and the brokering of materials.1

The dynamics of this trade were heavily influenced by the arrival of European goods, such as guns, blankets, beads, cloth, and metal kettles. Certain tribes, such as the Assiniboine, Hidatsa, Mandan, Sahnish, and some Oceti Sakowin groups, acted as brokers for these items, exchanging them for pelts and buffalo robes from groups further west. Similarly, the Cheyenne served as middlemen in the trade of horses between the southern and north-central Plains. Because these trade relationships were vital to the prosperity and influence of these nations, competition to dominate these economic corridors often led to conflict.1