Join Opie and the boy as they join the Corps of Discovery that was sent by President Thomas Jefferson to explore the new land acquired by the United States in the Louisiana Purchase. Follow along as the young brave Native American woman, Sacagawea, helps guide the expedition safely through thousands of miles of unexplored territory until they reach the Pacific Ocean. Learn how America expanded west across the Missouri river and relive all of the history, fun, and adventure by the end of A Possum's Expedition: Lewis & Clark and Sacagawea.