The Lewis and Clark expedition into the American west is one of the most legendary events in US history. Between 1804 and 1806, Sacagawea, a Shoshone Indian, guided Lewis and Clark from the Great Plains to the Pacific Ocean and back. Sacagawea interpreted Indian languages, knew what roots and plants to eat, and acquired horses that were crucial to the mission. She also had her infant son, Jean Baptiste, on the trip in which she carried on her back.