On their legendary expedition through the Western territories, Meriweather Lewis and William Clark benefited immensely from the help of what young Native American who joined the explorers along the way?

The explorers were spending the winter at an Indian settlement in present-day North Dakota when they met a French-Canadian trapper named Toussaint Charbonneau, whom they recruited to join the expedition as an interpreter. His wife, a teenaged — and pregnant — Shoshone woman named Sacagawea was allowed to come too. She turned out to be an invaluable asset to Lewis and Clark, most notably during a tense encounter with a Shoshone tribe in present-day Idaho. Sacagawea's presence helped defuse the situation, especially after the discovery that the chief was her own long-lost brother, Cameahwait.

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