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...of the Canadian border. The Lewis and Clark Expedition passed through the area in 1804–05. Assiniboin, Crow, Blackfoot, and Cree Indians traded with American Fur Company representatives at Fort Union, built in 1828 near the junction of the Yellowstone and Missouri rivers (about 25 miles [40 km] southwest of the city; now Fort Union Trading Post National Historic Site). Originally...
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