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Assiniboine Indians, A branch of the Dakota family, inhabiting each side of the boundary-line between the United States and British America in Montana and Manitoba. They were originally a part of the Yankton Sioux, but, after a bitter quarrel. they separated from the main body at the beginning of the seventeenth century, and the two bands have ever remained hostile. The French discovered them as early as 1640. In 1871 the number of Assiniboines in the United States was estimated at 4.850, and in 1900 there were 1.316, nearly equally divided at the Fort Peck and Fort Belknap agencies in Montana.