One year after the United States doubled its territory with the Louisiana Purchase, the Lewis and Clark expedition leaves St. Louis, Missouri, on a mission to explore the Northwest from the Mississippi River to the Pacific Ocean.
Even before the U.S. government concluded purchase negotiations with France, President Thomas Jefferson commissioned his private secretary Meriwether Lewis and William Clark, an army captain, to lead an expedition into what is now the U.S. Northwest. On May 14, the “Corps of Discovery”–featuring approximately 45 men (although only an approximate 33 men would make the full journey)–left St. Louis for the American interior.
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