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Geographic coordinates : 38 00 N, 97 00 W
Area:Total: 9,631,418 sq km; land: 9,161,923 sq km; water: 664,707 sq km
NOTE: includes only the 50 states and District of Columbia
Capital : Washington, DC
Population : 301,139,947 (July 2007 est.)
Climate : mostly temperate, but tropical in Hawaii and Florida, arctic in Alaska, semiarid in the great plains west of the Mississippi River, and arid in the Great Basin of the southwest; low winter temperatures in the northwest are ameliorated occasionally in January and February by warm chinook winds from the eastern slopes of the Rocky Mountains