Editing Lewis and Clark Expedition (section)

{{Short description|1804–1806 American expedition}}
{{Redirect|Lewis and Clark|the leaders of the expedition|Meriwether Lewis|and|William Clark|other uses}}
{{pp-vandalism|small=yes}}
{{Infobox event
| image = Lewis and Clark.jpg
| caption = Portraits of [[Meriwether Lewis]] and [[William Clark]]
| map = Lewis and Clark Expedition map.svg
| map_size = 300px
| map_caption = Route of expedition with modern borders
| date = {{start and end dates|1804|05|14|1806|09|23}}
| duration = 862 days
| motive = Explore the 1803 [[Louisiana Purchase]]
| organizers = U.S. President [[Thomas Jefferson]]
| participants = [[Corps of Discovery]], i.e. Lewis, Clark, and 40 men
| reported deaths = 1 – [[Charles Floyd (explorer)|Charles Floyd]], August 1804 near [[Sioux City, Iowa]]
}}
{{Use American English|date=March 2019}}
{{Use mdy dates|date=April 2024}}

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]]. 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, 1804, 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 1805. The return voyage began on March 23, 1806, at [[Fort Clatsop]], [[Oregon]], ending six months later on September 23 of that year.

President [[Thomas Jefferson]] commissioned the expedition, shortly after the Louisiana Purchase of 1803, to explore and detail as much of the new territory as possible. Furthermore, he wished to find a practical travel route across the western half of the continent—directly avoiding the hot and desolate desert [[Southwestern United States|southwest]]—and to establish an American presence in the new lands before European powers attempted to establish claims of their own. The campaign's secondary objectives were scientific, economical and humanitarian, i.e., to document the West's [[biodiversity]], [[topography]] and [[geography]] and to establish positive trade relations with (potentially unknown) [[Indigenous peoples of the Americas|Native American]] tribes. The expedition returned to [[St. Louis]] to report their findings to President Jefferson via maps, sketches, and various journals.<ref>[[#Woodger'09|Woodger, Toropov, 2009]] p. 150</ref><ref>[[#Ambrose|Ambrose, 1996]], Chap. VI</ref>