Often remembered merely for guiding Lewis and Clark, Sacagawea’s story is far more complex. Discover the deeper story behind the life of this Shoshone woman—beyond the expedition.

A growing body of evidence suggests she might have survived into old age — which would entirely change the story of America’s most iconic Native forebear.

Elizabeth “Lil” Fenn wants to frame the story of Sacagawea as a window on the American West, and the National Endowment for the Humanities wants to help her. Fenn, a distinguished professor of history ...