Tells the story of the most important expedition in American history, led by Captains Meriwether Lewis and William Clark. Includes the stories of the young army men, French-Canadian boatmen, Clark's African-American slave, and the Shoshone woman named Sacagawea who went with them. "Sent by President Thomas Jefferson to find the Northwest Passage, Meriwether Lewis and William Clark led the most important expedition in American history. This extraordinary...