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Harrisburg,city (1990 pop. 52,376), state capital and seat of Dauphin co., SE Pa., on the Susquehanna River; settled c.1710 by John Harris, who established a trading post and operated a ferry there; inc. 1791. It is a commercial, wholesale, administrative, and transportation center. Manufactures include metal products, transportation equipment, processed foods, machinery, electrical and electronic equipment, building materials, and steel. Harrisburg became the state capital in 1812 and grew as an inland transportation center with the opening of the Pennsylvania Canal in 1827 and the arrival of the railroad in 1836.
The sprawling Italian Renaissance state capitol (completed 1906) has a 272-ft (83-m) dome modeled after St. Peter's in Rome. Other notable structures are the education building, which contains the state library; the State Museum of Pennsylvania; the National Civil War Museum; the William Penn Memorial Museum; the John Harris Mansion (1766), headquarters of the county historical society; and the Soldiers' and Sailors' Memorial Bridge. A medical center and Harrisburg Univ. of Science and Technology, campuses of Temple and Widener universities, and the Dixon Univ. Center are in Harrisburg; the Pennsylvania State Univ. Harrisburg campus is in nearby Middletown. The city has numerous parks. To the south is the large Three Mile IslandThree Mile Island,
site of a nuclear power plant 10 mi (16 km) south of Harrisburg, Pa. On Mar. 28, 1979, failure of the cooling system of the No. 2 nuclear reactor led to overheating and partial melting of its uranium core and production of hydrogen gas, which raised fears of
..... Click the link for more information. facility, site of a nuclear accident in 1979. The New Cumberland Army Depot, the U.S. Army War College, and the U.S. Naval Supply Depot are also nearby.