• Sacagewea (1789-1812) ... led Lewis and Clark’s expedition to find the Pacific Ocean carrying her two month old child on her back ... her common law husband was a piece of work!
From Lewis and Clark Trail .com:
SACAGAWEA the only Native American woman who served as an interpreter and guide for 
As a child, she had been taken by members of the Hidatsa Tribe and lived among them. Later she was sold to a French-Canadian trapper named Toussaint Charbonneau.
While the Expedition wintered in the Hidatsa- Mandan Village (1804-1805), they hired Charbonneau as an interpreter for the trip west. Sacajawea, one of Charbonneau wives, and her baby accompanied the Expedition.