The Louisiana Purchase and American Expansion, 1803–1898

The 1803 purchase of the Louisiana Territory was a watershed event for the fledgling United States. Adding some 829,000 square miles of territory, the Louisiana Purchase set a striking precedent of Presidential power and brought to the surface profound legal and constitutional questions. As the nation continued to expand westward and into the Pacific and Caribbean, critical social, political and constitutional questions arose that greatly tested American resolve and reshaped the nation's foundin