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 most of the region and supplied the FPF with its equipment. The State Guard was disbanded in 1948. The South Dakota State Guard was reactivated during the Korean War from the years 1954 to 1956. The authority of each state to maintain a state defense force is recognized by the federal government under Title 32, Section 109 of the United States Code. Under this legislation, twenty-three other states and the territory of Puerto Rico currently maintain state defense forces. The South Dakota State Guard Act grants the Governor of South Dakota the authority to organize the South Dakota State Guard