The Lewis and Clark Expedition, officially known as the Corps of Discovery, is renowned for exploring the Louisiana Purchase from 1804 to 1806. Commissioned by President Thomas Jefferson, the expedition aimed to assess the newly acquired western territories, establish trade with Native Americans, and find a practical route to the Pacific Ocean. Leaders Meriwether Lewis and William Clark meticulously documented the geography, flora, fauna, and numerous indigenous cultures they encountered along the journey. Their exploration significantly enhanced America's understanding of its vast territories and laid foundational knowledge for future expansion and settlement westward.