Red Cloud Agency was established in 1871 on the North Platte River near Fort Laramie in Wyoming. It was mainly responsible for the Oglala Lakota in addition to some Cheyenne and Arapaho people. Prior to 1871 correspondence relating to these people was filed with the Upper Platte Agency. In 1878, after moving several times, the agency settled at White Clay Creek in Dakota and was renamed Pine Ridge Agency.
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