John Colter, a young Kentucky frontiersman, joins the Corps of Discovery to explore the continent with Meriwether Lewis and William Clark. Colter initially bristles at the military structure of the expedition but he soon becomes one of its most trusted members. The Corps of Discovery completes the journey of a lifetime by traveling to the Pacific Ocean and back, but John Colter decides to stay in the West and become one of the earliest American fur trappers.

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