The Lower Sioux Indian Community, (Dakota: Caŋṡa'yapi; ) also known as the Mdewakanton Tribal Reservation, is an Indian reservation located along the southern bank of the Minnesota River in Paxton and Sherman townships in Redwood County, Minnesota. Its administrative headquarters is two miles south of Morton. The reservation is located southeast of Redwood Falls, the county seat. The area was established as part of a reservation for the Mdewakanton and Wahpekute bands of the Lower Sioux under the Treaty of Traverse des Sioux in 1851 with the federal government. It originally extended about along the Minnesota River and was wide. It was greatly reduced following the Dakota War of 1862 and various other actions. As of the 2020 census, this lower reservation had a population of 534, and a land area of . History The area around the reservation is primarily rural, developed in the 21st century for agricultural commodity crops of corn and soybeans. The conversion of area creeks to agricultural ditches has also altered habitat and reduced the diversity of the ecology. Termination efforts From the 1940s to the 1960s, the United States government (including Congress) had a policy of terminating tribes, that is, ending the special relationships that they had with the federal government. The belief was that tribes would be selected that appeared to have adapted successfully to mainstream culture: in the process, any communal land would be distributed to individual households, and individuals would become residents of their respective counties and states, and under their jurisdiction. Four Native American tribes (each associated with separate reservations) in Minnesota were identified for termination in the 1950s. A memo dated January 19, 1955 for the BIA issued from the Department of the Interior indicates additional terminations were being reviewed in proposed legislation for what were primarily Dakota tribes in southern Minnesota, including the Lower Sioux Community in Redwood and Scott counties, the New Upper Sioux Community in Yellow Medicine County, the Prairie Island Community in Goodhue County, and about 15 individuals living on restricted tracts in Yellow Medicine County. Discussions between the BIA and the tribal Indians from the targeted area began in 1953 and continued throughout 1954. Though the Prairie Island and Lower Sioux communities drafted agreements for distribution of land to individual households and ownership, the Upper Sioux strongly opposed fee-simple title to communal tribal lands. On January 26, 1955 Senator Edward Thye introduced a bill