What was the main mission of Lewis and Clark's expediton?

The main mission of Lewis and Clark's expedition, officially known as the Corps of Discovery, was to explore and map the newly acquired western territories of the United States following the Louisiana Purchase. Commissioned by President Thomas Jefferson in 1803, their goals included establishing trade routes, documenting the geography and Natural Resources of the region, and seeking a water route to the Pacific Ocean. The expedition also aimed to strengthen American claims to the land and foster relations with Native American tribes.