Geography of South Dakota of the federal or state government, such as Badlands National Park, Wind Cave National Park, and Custer State Park, are located in the state. In 2011, the population of South Dakota was estimated to be 824,082, and the state ranks fifth-lowest in both total population as well as population density in the United States. Sioux Falls, with a population of just over 170,000, is the largest city in the state. Rapid City ranks as South Dakota's second-largest city, and Pierre is the state capital. Historically a very agricultural state, the service and tourism sectors have grown in economic importance in
South Dakota State Guard of the federal military. The South Dakota National Guard was federalized in 1917. By 1917, Home Guard units were organizing in various counties and townships. In 1918, the South Dakota Legislature passed legislation allowing for the creation of a Home Guard. South Dakota’s Home Guard, which was particularly active in protecting property from fire, reached a strength of 100 companies consisting of approximately 7,000 men by the end of the war. The State Guard was disbanded later in 1918. Following the federalization of the South Dakota National Guard during World War II, South Dakota raised four companies of militia using