The historic expedition undertaken by Lewis and Clark in the early 19th century is known as the Lewis and Clark Expedition, or the Corps of Discovery. Commissioned by President Thomas Jefferson in 1803, the expedition aimed to explore the newly acquired Louisiana Territory and find a practical route to the Pacific Ocean. Starting in May 1804, Meriwether Lewis and William Clark, along with their team, traveled over 8,000 miles, documenting new lands, wildlife, and Native American tribes along the way. Their journey significantly contributed to American geography, promoted westward expansion, and enhanced the nation's understanding of its vast territories.