History of South Dakota - 19th Century

19th Century

In 1803, the United States purchased the Louisiana Territory from Napoleon for $15,000,000. The territory included most of the western half of the Mississippi watershed and covered nearly all of present-day South Dakota, except for a small portion in the northeast corner of the state. The region was still largely unexplored and unsettled, and President Thomas Jefferson organized a group commonly referred to as the Lewis and Clark Expedition to explore the newly acquired region. The expedition, also known as the Corps of Discovery, was tasked with following the route of the Missouri to its source, continuing on to the Pacific Ocean, establishing diplomatic relations with the various tribes in the area, and taking cartographic, geologic, and botanical surveys of the area. The expedition left St. Louis on May 14, 1804 with 45 men and 15 tons of supplies in three boats (one keelboat and two pirogues). The party progressed slowly against the Missouri's current, reaching what is today South Dakota on August 22. Near present-day Vermillion, the party hiked to Spirit Mound after hearing local legends of the place being inhabited by "little spirits". Shortly after this, a peaceful meeting took place with the Yankton Sioux, while an encounter with the Lakota Sioux further north was not as uneventful. The Lakota mistook the party as traders, at one point stealing a horse. Weapons were brandished on both sides after it appeared as though the Lakota were going to further delay or even halt the expedition, but they eventually stood down and allowed the party to continue up the river and out of their territory. In north central South Dakota, the expedition acted as mediators between the warring Arikara and Mandan. After leaving the state on October 14, the party wintered with the Mandan in North Dakota before successfully reaching the Pacific Ocean and returning by the same route, safely reaching St. Louis in 1806. On the return trip, the expedition spent only 15 days in South Dakota, traveling more swiftly with the Missouri's current.

In 1817, an American fur trading post was set up at present-day Fort Pierre, beginning continuous American settlement of the area. During the 1830s, fur trading was the dominant economic activity for the few Whites that lived in the area. Most of these trappers and traders left the area after European demand for furs dwindled around 1840. In 1855, the U.S. Army bought Fort Pierre but abandoned it the following year 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.

Land speculators founded two of eastern South Dakota's largest present-day cities: Sioux Falls in 1856 and Yankton in 1859. In 1861, Dakota Territory was established by the United States government (this initially included North Dakota, South Dakota, and parts of Montana and Wyoming). Settlers from Scandinavia, Germany, Ireland, and Russia, as well as elsewhere in Europe and from the eastern U.S. states increased from a trickle to a flood, especially after the completion of an eastern railway link to the territorial capital of Yankton in 1872, and the discovery of gold in the Black Hills in 1874 during a military expedition led by George A. Custer. This expedition took place despite the fact that the western half of present day South Dakota had been granted to the Sioux by the Treaty of Fort 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. The Sioux were eventually defeated and settled on reservations within South Dakota and North Dakota.

An increasing population caused Dakota Territory to be divided in half and a bill for statehood for North Dakota and South Dakota (as well as Montana and Washington) titled the Enabling Act of 1889 was passed on February 22, 1889 during the Administration of Grover Cleveland. It was left to his successor, Benjamin Harrison, to sign proclamations formally admitting North and South Dakota to the Union on November 2, 1889. Harrison directed his Secretary of State James G. Blaine to shuffle the papers and obscure from him which he was signing first and the actual 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 Sioux Nation, the massacre resulted in the deaths of an estimated 300 Sioux, many of them women and children. 25 U.S. soldiers were also killed in the conflict.