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city, seat (1888) of Sheridan county, northern Wyoming, U.S., at the confluence of Big Goose and Little Goose creeks, on the east slope of the Bighorn Mountains near the Montana border. It was founded in 1882 and named for General Philip H. Sheridan, Union cavalry leader during the American Civil War. Not until a series of wars subdued the Cheyenne, Sioux, and Crow was the area well settled. The arrival of the railroad (1892) and the discovery of coal stimulated its growth.