South Dakota South Dakota South Dakota () is a U.S. state in the Midwestern region of the United States. It is named after the Lakota and Dakota Sioux Native American tribes, who compose a large portion of the population and historically dominated the territory. South Dakota is the seventeenth largest by area, but the fifth smallest by population and the 5th least densely populated of the 50 United States. As the southern part of the former Dakota Territory, South Dakota became a state on November 2, 1889, simultaneously with North Dakota. Pierre is the state capital and Sioux Falls, with a population
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