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advanced In 1803, the United States purchased the Louisiana Territory from Napoleon, 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, would travel through the area twice along the Missouri River on their way to and from the Pacific Ocean. In 1817, an American fur trading post was set up at present-day Fort Pierre, beginning continuous American settlement of the
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