Although the Convention of 1818 settled the boundary from the point of view of the non-Aboriginal powers, neither the United Kingdom nor the United States was immediately sovereign over the territories on its side of the line: effective control still rested with the local nations, mainly the Métis, Assiniboine, Lakota and Blackfoot.
Images of Assiniboine people were painted by such 19th-century artists as Karl Bodmer and George Catlin.
In 1914–1915 and again in 1917 Warner served as a missionary among the Sioux and Assiniboine at the Fort Peck Indian Reservation.
Georgia Wettlin Larsen is a Nakota singer who has released several discs featuring Native American songs.
She has also taught at Greenhaven Maximum Security Prison for Men in upstate New York and in Native American schools on the Salish, Sioux, Assiniboine, Northern Cheyenne, Flathead, Blackfeet, Crow, Tohono O'odham and Yaqui nations.
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Ethnographic accounts indicate that the Assiniboine, Sioux, Mandan, Hidatsa, Plains Ojibwa, and Atsina peoples all made use of the region for hunting or trade route purposes, though few archaeological sites have been formally identified.
Within its 240 hectares (about 600 acres) there are 19 sites that represent the active and historical society of Northern Plains Peoples composed of Cree, Assiniboine, Saulteaux, Atsina, Dakota, and Blackfoot.
Images of Assiniboine people were painted by such 19th century artists as Karl Bodmer and George Catlin.