View images of Lewis and Clark, and the Native Americans they encountered. With a budget approved by Congress and a mastermind in Thomas Jefferson, Meriwether Lewis and William Clark embarked on a fantastic adventure in 1804 to explore the uncharted, unknown American West for the U.S. government. Jefferson dubbed them the “Corps of Discovery.” The team documented the wildlife, plants, and geography of the region. During their four-year journey, they crossed thousands of miles and found critical support in native tribes like the Shoshone Indians and the young Sacagawea, the only woman to travel with them. View images of the Lewis and Clark, the Native Americans they encountered, and more.