South Dakota


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 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.

In 1861, the Dakota Territory was established by the United States government (this initially included North Dakota, South Dakota, and parts of Montana and Wyoming). Settlement of the area, mostly by people from the eastern United States as well as western and northern Europe, increased rapidly, especially after the completion of an eastern railway link to Yankton in 1873 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 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. The Sioux were eventually defeated and settled on reservations within South Dakota and North Dakota.

An increasing population caused the Dakota Territory to be divided in half and a bill for statehood for both Dakotas titled the Enabling Act of 1889 was passed on February 22, 1889 during the Administration of Grover Cleveland. His successor, Benjamin Harrison, signed proclamations formally admitting both states on November 2, 1889. Harrison had the papers shuffled to obscure from him which he was signing first and the actual order went unrecorded.






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