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.
Montmartre, Saskatchewan
Assiniboine is a Siouan language. It was derived from other Sioux dialects at the same time as other Sioux languages were being diverged and differentiated from each other. The language today is endangered, and there are very few speakers that are living. Most Assiniboine today are English speakers.