Casper, Wyoming, the state's largest city and the seat of Natrona County. It is on the North Platte River in east-central Wyoming, at the edge of the Great Plains. Casper's economy is based primarily on petroleum refining and shipping; ranching and mining in adjacent areas; manufacturing; and tourism. Nearby is the Salt Creek oil field, which includes Teapot Dome, the naval reserve that figured in a notorious scandal in the early 1920's.
Casper was founded in 1888 at the terminus of a railroad serving a cattle producing area. The town site was on the old Oregon Trail, which was heavily traveled by pioneers in the 1840's and 1850's. Oil was discovered at Salt Creek in 1890 and provided the basis for much of the city's growth.