Cedar, 19, Nicole, 17, and Genna Henry, 14, are members of the Mandan, Hidatsa and Arikara Nation the Three Affiliated Tribes in New Town, S.D. The Town was created after construction of a dam on the upper Missouri flooded the tribes' villages.
Lewis and Clark braved the unknown waters of the Missouri to chart America's future. As we approach the 200th anniversary of their sojourn, TIME reflects upon their sacrifice and achievement