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May 14, 1804 marks the start of the famous Lewis and Clark Expedition, launched from near St. Louis, Missouri. Commissioned by President Thomas Jefferson after the Louisiana Purchase, the mission aimed to explore and map the vast, uncharted western territories of the United States. Meriwether Lewis and William Clark led a diverse team known as the "Corps of Discovery," which included Sacagawea, a Shoshone guide and translator. Their journey laid the groundwork for westward expansion and dramatically increased geographic and scientific knowledge of North America.