United States: Native Place, Environment, And The Trade Fort Concentration On The South Platte River, 1835–45   Cody Newton, 2012   This article analyzes the unusual trading post concentration—Fort Vasquez, Fort Jackson, Fort Lupton, and Fort St. Vrain—that operated simultaneously along the South Platte River during the late 1830s. These trading posts, or forts, dealt almost exclusively in bison robes provided by Sioux, Cheyenne, and Arapaho hunters. The reasons behind this trading...

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