As a female Native American, Sacagawea's story could easily have been lost to history. But her role as a vital member of Lewis and Clark's Corps of Discovery, helping them forge relationships with Native Americans all while carrying her newborn baby on her back, ensured this wasn't the case. Sacagawea travelled thousands of miles with the Lewis and Clark expedition of 1804-6 – from the Mandan-Hidatsa villages in the Dakotas to the Pacific Northwest – acting as an interpreter and allaying the suspicions of the tribes they encountered.