The first farmers in the region of whom there is definite knowledge were Native Americans of the Mandan tribe. Other agricultural tribes were the Arikara and the Hidatsa. Seminomadic and nomadic tribes were the Cheyenne, Cree, Sioux, Assiniboin, Crow, and Ojibwa (Chippewa). | The first farmers in the region of whom there is definite knowledge were Native Americans of the Mandan tribe. Other agricultural tribes were the Arikara and the Hidatsa. Seminomadic and nomadic tribes were the Cheyenne, Cree, Sioux, Assiniboin, Crow, and Ojibwa (Chippewa). |