Dakota Territory in the context of Minnesota Territory

South Dakota (/dəˈkoʊtə/ ; Siouan languages: Dakȟóta itókaga, pronounced [daˈkˣota iˈtokaga]) is a landlocked state in the North Central region of the United States. It is also part of the Great Plains. South Dakota is named after the Dakota Sioux tribe, which comprises a large portion of the population—with nine reservations in the state—and has historically dominated the territory. South Dakota is the 17th-largest by area, the fifth-least populous, and the fifth-least densely populated of the 50 United States. Pierre is the state capital, and Sioux Falls, with a population of about 213,900, is South Dakota's most populous city. The state is bisected by the Missouri River, dividing it into two geographically and socially distinct halves known as "East River" and "West River". South Dakota is bordered by North Dakota to the north, Minnesota to the east, Iowa to the southeast, Nebraska to the south, Wyoming to the west, and Montana to the northwest.

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. As the southern part of the former Dakota Territory, South Dakota became a state on November 2, 1889, simultaneously with North Dakota. They are the 39th and 40th states admitted to the union; President Benjamin Harrison shuffled the statehood papers before signing them so that no one could tell which became a state first.

The Dakotas, also known as simply Dakota, is a collective term for the U.S. states of North Dakota and South Dakota. It has been used historically to describe the Dakota Territory, and is still used for the collective heritage, culture, geography, fauna, sociology, economy, and cuisine of the two states.

The Ponca people (Omaha-Ponca: Páⁿka) are a nation primarily located in the Great Plains of North America that share a common Ponca culture, history, and language, identified with two Indigenous nations: the Ponca Tribe of Indians of Oklahoma or the Ponca Tribe of Nebraska.

This nation comprised the modern-day Ponca, Omaha, Kaw, Osage, and Quapaw peoples until the mid-17th century when the people sought to establish their nation west of the Mississippi River as a result of the Beaver Wars. By the end of the 18th century, the Ponca people had established themselves at the mouth of the Niobrara River near its confluence with the Missouri River, remaining there until 1877 when the United States forcibly removed the Ponca people from the Ponca Reservation in the Dakota Territory to the Indian Territory. This event, known as the Ponca Trail of Tears, resulted in the deaths of hundreds of Ponca civilians and the splintering of the nation. In 1879, two years after the removal, a small portion of the Ponca elected to return to Nebraska in 1879. This group, led by Standing Bear, ultimately gave rise to the present-day Ponca Tribe of Nebraska. Two years later, the majority of the Ponca were given the opportunity to return to Nebraska but elected against doing so, having established themselves on a new reservation in the Indian Territory. This group, led by White Eagle, ultimately gave rise to the Ponca Tribe of Oklahoma.

Cheyenne (/ʃaɪˈæn/ shy-AN or /ʃaɪˈɛn/ shy-EN) is the capital and most populous city of the U.S. state of Wyoming. The population was 65,132 at the 2020 census, while the Cheyenne metropolitan area encompassing all of Laramie County has an estimated 102,000 residents. Cheyenne is situated on Crow Creek and Dry Creek. It is the county seat of Laramie County.

Cheyenne was established within the Dakota Territory in 1867 as a junction along the Union Pacific Railroad. Local residents named the town for the Cheyenne people. Its economy is anchored by government services, transportation, and military operations, notably Francis E. Warren Air Force Base, with emerging growth in data centers and renewable energy. Cheyenne hosts cultural institutions such as the Wyoming State Museum and Cheyenne Frontier Days Old West Museum, and is known for the annual Cheyenne Frontier Days, a longstanding rodeo and cultural event. Cheyenne is the northern terminus of the extensive Southern Rocky Mountain Front.

Bismarck (/ˈbɪzmɑːrk/) is the capital city of the U.S. state of North Dakota and the county seat of Burleigh County. It is the state's second-most populous city, after Fargo. The population was 73,622 at the 2020 census, and was estimated at 77,772 in 2024, while its metropolitan population was 133,626. In 2014, Forbes magazine ranked Bismarck as the seventh fastest-growing small city in the United States.

Bismarck was founded by European-Americans in 1872 on the east bank of the Missouri River. It has been North Dakota's capital city since 1889, when the state was created from the Dakota Territory and admitted to the Union.

The Black Hills gold rush took place in Dakota Territory in the United States. It began in 1874 following the Custer Expedition and reached a peak in 1876–77.

Rumors and poorly documented reports of gold in the Black Hills go back to the early 19th century. In the 1860s, Roman Catholic missionary Father De Smet is reported to have seen Sioux Indians carrying gold which they told him came from the Black Hills.

The Dakota War of 1862, also known as the U.S.-Dakota War of 1862, the Sioux Uprising, the Dakota Uprising, the Sioux Outbreak of 1862, the Dakota Conflict, or Little Crow's War, was an armed conflict between the United States and several eastern bands of Dakota collectively known as the Santee Sioux. It began on August 18, 1862, when the Dakota, who were facing starvation and displacement, attacked the Lower Sioux Agency and white settlements along the Minnesota River valley in southwest Minnesota. The war lasted for five weeks and resulted in the deaths of hundreds of settlers and the displacement of thousands more. In the aftermath, the Dakota people were exiled from their homelands, forcibly sent to reservations in the Dakotas and Nebraska, and the State of Minnesota confiscated and sold all their remaining land in the state. Thirty-eight Dakota men were subsequently hanged for crimes committed during the conflict in the largest mass execution in US history.

All four bands of eastern Dakota had been pressured into ceding large tracts of land to the United States in a series of treaties and were reluctantly moved to a reservation strip twenty miles wide, centered on the Minnesota River. There, they were encouraged by U.S. Indian agents to become farmers rather than continue their hunting traditions. A crop failure in 1861, followed by a harsh winter along with poor hunting due to depletion of wild game, led to starvation and severe hardship for the eastern Dakota. In the summer of 1862, tensions between the eastern Dakota, the traders, and the Indian agents reached a breaking point. On August 17, 1862, four young Dakota men killed five white settlers in Acton, Minnesota, after a disagreement. That night, a faction led by Chief Little Crow decided to attack the Lower Sioux Agency the next morning in an effort to drive all settlers out of the Minnesota River valley. The demands of the Civil War slowed the U.S. government response, but on September 23, 1862, an army of volunteer infantry, artillery and citizen militia assembled by Governor Alexander Ramsey and led by Colonel Henry Hastings Sibley finally defeated Little Crow at the Battle of Wood Lake. Little Crow and a group of 150 to 250 followers fled to the northern plains of Dakota Territory and Canada.