![]() ![]() ![]() The primary objectives were to explore and map the newly acquired territory, find a practical route across the Western half of the continent, and establish an American presence in this territory before Britain and other European powers tried to claim it. Army volunteers under the command of Captain Meriwether Lewis and his close friend Second Lieutenant William Clark. The expedition was commissioned by President Thomas Jefferson shortly after the Louisiana Purchase in 1803 and consisted of a select group of U.S. Louis on the Mississippi River, making their way westward through the continental divide to the Pacific coast. The Lewis and Clark Expedition, also known as the Corps of Discovery Expedition, was the first American expedition to cross what is now the western portion of the United States, departing in May, 1804 from St. Additional information at with a link to the NHPRC-supported abridged edition at ![]()
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