Answer:
Toussaint Charbonneau, Sacagawea, and the Hidatsa Indians.
Step-by-step explanation:
They encountered the French-Canadian trapper Toussaint Charbonneau at Fort Mandan and eventually recruited him on as an interpreter. Fortunately, Sacagawea, his pregnant Shoshone wife, was permitted to accompany him on the journey. The Hidatsa Indians had abducted Sacagawea when she was 12 years old and sold her to Charbonneau.