A History of America - Season 1 Episode 6 Westward Expansion

At the dawn of the 19th century, the size of the United States doubles with the Louisiana Purchase. The Appalachians are no longer the barrier to American migration west; the Mississippi River becomes the country's central artery; and Jefferson's vision of an Empire of Liberty begins to take shape. Historian Stephen Ambrose joins Maier and Miller in examining the consequences of the Louisiana Purchase – for the North, the South, and the history of the country.