Siouan languages
Siouan or Siouan–Catawban is a language family of North America that is located primarily in the Great Plains, Ohio and Mississippi valleys and southeastern North America with a few other languages in the east.
Hidatsa language
Hidatsa is an endangered Siouan language that is related to the Crow language. It is spoken by the Hidatsa tribe, primarily in North Dakota and South Dakota.