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Sidney, city, seat (1870) of Cheyenne county, western Nebraska, U.S. It lies in the valley formed by Lodgepole Creek, a few miles north of the Colorado state line, in the Nebraska panhandle. It was founded in 1867 by the Union Pacific Railroad as a construction camp and named for Sidney Dillon, president of the railroad. Because of raids by the Sioux, Fort Sidney was built nearby. The city became an important cattle-ranching area and served...