sentences:  This was under the Land Buy-Back Program for Tribal Nations, established as part of the federal government's settlement of the landmark "Cobell v. Salazar" suit over federal mismanagement of revenues due Indian landowners under the trust program.The federal government established the Great Sioux Reservation under the Treaty of 1851, encompassing much of the area of West River in what is now South Dakota, as well as portions of North Dakota and Nebraska.As some bands of the Sioux agreed to come in to agencies, others chose to resist.