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Plattsmouth, city, seat (1855) of Cass county, eastern Nebraska, U.S., near the confluence of the Platte and Missouri rivers, about 20 miles (32 km) south of Omaha. Oto and Omaha Indians were early inhabitants. French explorers visited the area in 1730, and the Lewis and Clark Expedition camped there in 1804. In 1852 a ferry across the Missouri was started, and the community was founded in 1854. The city developed as a steamboat and stagecoach...