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The Mandan , Hidatsa , and Arikara Nations came together in the nineteenth century after several devastating smallpox epidemics. In 1934, they formally joined together to become the Three Affiliated Tribes of Fort Berthold. Today, the Three Affiliated Tribes maintain just under one million acres of land on the Fort Berthold Reservation in northwestern North Dakota. As a government, the Three Affiliated Tribes administer a variety of services for their citizens, including economic programs, healthcare, and education.