Who were charbonneau and Sacagawea why were they recruited to join the mission?

Charbonneau was a French-Canadian fur trader, and Sacagawea was a Shoshone woman who served as his wife. They were recruited by the Lewis and Clark Expedition primarily for their skills and knowledge; Charbonneau was familiar with the region and its trade networks, while Sacagawea's linguistic abilities and understanding of Native American cultures were invaluable for navigating and communicating with various Indigenous tribes. Their presence also symbolized peace, as a woman and child traveling with the expedition helped to signal non-hostility to Native American groups they encountered.