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Native Americans and the Fur Traders
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).
With the Louisiana Purchase of 1803 the northwestern half of North Dakota became part of the United States. The southeastern half was acquired from Great Britain in 1818 when the international line with Canada was fixed at the 49th parallel. Earlier the Lewis and Clark expedition had wintered (1804–5) with the Mandan and the North West Company and the Hudson's Bay Company had established trading posts in the Red River valley. These ventures introduced an industry that dominated the region for more than half a century. Within that era the buffalo vanished from the plains and the beaver from the rivers.
From its post at Fort Union, which was established in 1828, John Jacob Astor's American Fur Company gradually gained monopolistic control for a time over the region's trade. Supply and transport were greatly facilitated when a paddlewheel steamer, the Yellowstone, inaugurated steamboat travel on the turbulent upper Missouri in 1832. Additional transportation was provided by the supply caravans of Red River carts, which went westward across the Minnesota prairies and returned to the Mississippi loaded with valuable pelts. In 1837, the introduction of smallpox by settlers decimated the Mandan tribe.
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