ATSINA

also called Gros Ventres of the Prairie an offshoot of the Algonkian-speaking Arapaho tribe of North American Indians, from which they may have separated as early as 1700; they were living in what is now northern Montana and adjacent regions of Canada in late historic times and were culturally similar to other Plains tribes. Together with the Assiniboin, they were settled on Fort Belknap Reservation, Montana, where the combined population totalled fewer than 2,000 in the late 20th century. See also Arapaho.