South Dakota (; locally ) is a state located in the Midwestern region of the United States. It is named after the Lakota and Dakota Sioux Native American tribes. South Dakota is the 17th most extensive, but the 5th least populous and the 5th least densely populated of the 50 United States. Once the southern portion of the 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 of about 159,000, is South Dakota's largest city.
South Dakota is bordered by the states of North Dakota, Minnesota, Iowa, Nebraska, Wyoming, and Montana. The state is bisected by the Missouri River, dividing South Dakota into two geographically and socially distinct halves, known to residents as "East River" and "West River". Eastern South Dakota is home to most of the state's population, and fertile soil in this area is used to grow a variety of crops. West of the Missouri, ranching is the predominant agricultural activity, and the economy is more dependent on tourism and defense spending. The Black Hills, a group of low pine-covered mountains sacred to the Sioux, are located in the southwest part of the state. Mount Rushmore, a major tourist destination, is located there. South Dakota experiences a temperate continental climate, with four distinct seasons and precipitation ranging from moderate in the east to semi-arid in the west. The ecology of the state features species typical of a North American grassland biome.
Humans have inhabited the area for several millennia, with the Sioux becoming dominant by the early 19th century. In the late 19th century, European-American settlement intensified after a gold rush in the Black Hills and the construction of railroads from the east. Encroaching miners and settlers triggered a number of Indian wars, ending with the Wounded Knee Massacre in 1890. Key events in the 20th century included the Dust Bowl and Great Depression, increased federal spending during the 1940s and 50s for agriculture and defense, and an industrialization of agriculture which has much reduced family farming.
While several Democratic senators have represented South Dakota for multiple terms at the federal level, the state government is largely controlled by the Republican Party, whose nominees have carried South Dakota in each of the last 12 presidential elections. Historically dominated by an agricultural economy and a rural lifestyle, South Dakota has recently sought to diversify its economy in areas to attract and retain residents. South Dakota's history and rural character still strongly influence the culture of the state.
By 1500, the Arikara (or Ree) had settled in much of the Missouri River valley. European contact with the area began in 1743, when the LaVerendrye brothers explored the region. The LaVerendrye group buried a plate near the site of modern day Pierre, claiming the region for France as part of greater Louisiana. in 1762 the entire region became part of the Spanish Louisiana until 1802. By the early 19th century, the Sioux had largely replaced the Arikara as the dominant group in the area.
In 1803, the United States purchased the Louisiana Territory, an area that included most of South Dakota, from Napoleon Bonaparte, and President Thomas Jefferson organized a group commonly referred to as the "Lewis and Clark Expedition" to explore the newly acquired region. In 1817, an American fur trading post was set up at present-day Fort Pierre, beginning continuous American settlement of the area. In 1855, the U.S. Army bought Fort Pierre but abandoned it in 1857 in favor of Fort Randall to the south. Settlement by Americans and Europeans was by this time increasing rapidly, and in 1858 the Yankton Sioux signed the 1858 Treaty, ceding most of present-day eastern South Dakota to the United States.
In 1874, gold was discovered in the Black Hills during a military expedition led by George A. Custer and miners and explorers began illegally entering land promised to the Lakota. Custer's expedition took place despite the fact that the US had granted the entire western half of present-day South Dakota (West River) to the Sioux in 1868 by the Treaty of Laramie as part of the Great Sioux Reservation. The Sioux declined to grant mining rights or land in the Black Hills, and war broke out after the U.S. failed to stop white miners and settlers from entering the region. Eventually the US defeated the Sioux and broke up the Great Sioux Reservation into five reservations, settling the Lakota in those areas. (In 1980, the US Supreme Court and Congress ordered payment to the Lakota for the illegal seizure of the Black Hills. The case remains unsettled, as the Lakota refuse to accept the money and instead insist on the return of the land.)
A growing population caused Dakota Territory to be divided in half and President Benjamin Harrison signed proclamations formally admitting both South Dakota and North Dakota to the union on November 2, 1889. Harrison had the papers shuffled to obscure which one was signed first and the order went unrecorded.
On December 29, 1890, the Wounded Knee Massacre occurred on the Pine Ridge Indian Reservation. Commonly cited as the last major armed conflict between the United States and the Lakota Sioux Nation, the massacre resulted in the deaths of at least 146 Sioux, many of them women and children. 31 U.S. soldiers were also killed in the conflict.
Economic stability returned with the U.S. entry into World War II in 1941, when demand for the state's agricultural and industrial products grew as the nation mobilized for war. In 1944, the Pick–Sloan Plan was passed as part of the Flood Control Act of 1944 by the U.S. Congress, resulting in the construction of six large dams on the Missouri River, four of which are at least partially located in South Dakota. Flood control, hydroelectricity, and recreational opportunities such as boating and fishing are provided by the dams and their reservoirs.
In recent decades, South Dakota has been transformed from a state dominated by agriculture to one with a more diversified economy. The tourism industry has grown considerably since the completion of the interstate system in the 1960s, with the Black Hills becoming more important as a destination. The financial service industry began to grow in the state as well, with Citibank moving its credit card operations from New York to Sioux Falls in 1981, a move that has since been followed by several other financial companies. South Dakota was the first state to eliminate caps on interest rates.
In 2007, the site of the recently closed Homestake gold mine near Lead was chosen as the location of a new underground research facility, the Deep Underground Science and Engineering Laboratory. Despite a growing state population and recent economic development, many rural areas have been struggling over the past 50 years with locally declining populations and the emigration of educated young adults to larger South Dakota cities, such as Rapid City or Sioux Falls, or to other states. Mechanization and consolidation of agriculture has contributed greatly to the declining number of smaller family farms and the resulting economic and demographic challenges facing rural towns.
Note: Most of present-day North and South Dakota was acquired as part of the Louisiana Purchase of 1803, and was included in Louisiana (soon renamed Missouri) Territory. The part generally west of the Missouri River remained in Missouri Territory until becoming part of Nebraska Territory, formed in 1854. The portion east of the Missouri became successively part of Michigan Territory (1834), Wisconsin Territory (1836), Iowa Territory (1838), and Minnesota Territory (1849). After Minnesota became a State in 1858, this area remained unorganized until Dakota Territory was established in 1861, including all of the present-day Dakotas as well as most of Montana and the northern half of Wyoming. After 1868 Dakota Territory corresponded to the present two States, plus an area transferred to Nebraska in 1882. South Dakota (like North Dakota) was admitted as a State on November 2, 1889 with essentially its present boundaries. Present-day South Dakota had no census coverage in 1850. The population given for 1860 is for the whole of Dakota Territory as organized in 1861, essentially comprising present-day South and North Dakota east of the Missouri River; no determination has been made to assign the 1860 total to what became the two separate States. In 1860, some forts and settlements in the present State also were enumerated in Nebraska Territory. The 1870 and 1880 populations consist of the totals of those counties of Dakota Territory located wholly or primarily in what is now South Dakota, plus (in 1870) an estimated portion of the Territory's unorganized part. The total population of Dakota Territory was 14,181 in 1870 and 135,177 in 1880. Considerable portions of the State were not covered by the census until 1900.. Total for 1860 is for entire Dakota Territory as organized in 1861, essentially comprising present-day South and North Dakota east of the Missouri River. Totals for 1870 and 1880 are totals of those counties of Dakota Territory located wholly or primarily in what is now South Dakota; in addition, 1870 total includes an estimated share (899) of the population of the Territory's unorganized portion (2,091). Certain Indian reservations not reported by county in 1880, 1890, or 1900 are shown as separate entries after the counties; only one of these was enumerated in 1880. Total for 1890 includes 4 Indians in prison, not reported by county or reservation. In 1890 the population (4,206) of the entire Standing Rock Indian Reservation was credited to North Dakota, although much of it was in South Dakota.
Outstanding guide to South Dakota family history and genealogy (FamilySearch Research Wiki). Birth, marriage, and death records, wills, deeds, county records, archives, Bible records, cemeteries, churches, censuses, directories, immigration lists, naturalizations, maps, history, newspapers, and societies.