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– American expedition

"Lewis and Clark" redirects here. For the leaders of the expedition, see Meriwether Lewis and William Clark. For other uses, see Lewis and Clark (disambiguation).

The Lewis and Clark Expedition, also known as the Corps of Discovery Expedition, was the United States expedition to cross the newly acquired western portion of the country after the Louisiana Purchase.

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The Corps of Discovery was a select group of U.S. Army and civilian volunteers under the command of Captain Meriwether Lewis and his close friend Second Lieutenant William Clark. Clark, along with 30 others, set out from Camp Dubois (Camp Wood), Illinois, on May 14, , met Lewis and ten other members of the group in St.

Charles, Missouri, then went up the Missouri River. The expedition crossed the Continental Divide of the Americas near the Lemhi Pass, eventually coming to the Columbia River, and the Pacific Ocean in The return voyage began on March 23, , at Fort Clat