An in-depth look at Lewis and Clark's historic expedition through the explorers' journals--America's "first report on the West" (Bernard DeVoto, Pulitzer Prize-winning scholar-historian of the American West). In 1803, the great expanse of the Louisiana Purchase was an empty canvas. Keenly aware that the course of the nation's destiny lay westward--and that a "Voyage of Discovery" would be necessary to determine the nature...