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Williston, city, seat (1891) of Williams county, northwestern North Dakota, U.S. It lies on the Missouri River, 20 miles (30 km) east of the Montana state line and 65 miles (105 km) south 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...