Sacagawea and her son Pomp (Jean Baptiste Charbonneau), Fort Clatsop near Astoria, Oregon

Sacagawea, a Shoshone, and her son Jean Baptiste Charbonneau, members of Lewis and Clark Expedition. William Clark nicknamed the boy Pomp, who was the youngest member of the Expedition, the Corps of Discovery. Pomp's father was French Canadian, Toussaint Charbonneau, who worked as a trapper and interpreter for the Lewis and Clark Expedition.

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