What historic exploration took place in 1804?

In 1804, the Lewis and Clark Expedition, officially known as the Corps of Discovery, began its journey to explore the newly acquired western portion of the United States following the Louisiana Purchase. Led by Meriwether Lewis and William Clark, the expedition aimed to map the territory, establish trade with Native American tribes, and find a route to the Pacific Ocean. They traveled from St. Louis, Missouri, to the Pacific Northwest, returning in 1806 with valuable information about the geography, flora, fauna, and indigenous peoples of the region. This exploration significantly contributed to the westward expansion of the United States.