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 University Among alumni who are political figures are seven members of Congress, most notably Majority Leader of the United States Senate, Tom Daschle and first American Indian member of Congress Ben Reifel. Alumni of South Dakota State have occupied top positions in Wall Street and the rest of the business world, including CEO of Kuwait Petroleum Corporation, Nizar Al-Adsani. In science and technology, alumni include IBM 360 inventor Gene Amdahl, "father of Amdahl's law", and Nobel laureate Theodore Schultz, "father of Human Capital Theory." South Dakota State University South Dakota State University is a public research university in Brookings, South Dakota,