The route skirted the northern edge and crossed the north-western corner of Comancheria, the territory of the Comanche. Realizing the value, they demanded compensation for granting passage to the trail. American traders envisioned them as another market. Comanche raiding farther south in Mexico isolated New Mexico, making it more dependent on the American trade. They raided to gain a steady supply of horses to sell. By the 1840s, trail traffic through the Arkansas Valley was so numerous that bison herds were cut off from important seasonal grazing land. This habitat disruption, on top of overhunting, contributed to the collapse of the species. Comanche power declined in the region when they lost their most important game.[5]
