America's Westward Expansion Trails: The History and Legacy of the 19th Century's Most Famous Routes to the West

The Lewis and Clark Expedition, notwithstanding its merits as a feat of exploration, was also the first tentative claim on the vast interior and the western seaboard of North America by the United States. It set in motion the great movement west that began almost immediately with the first commercial overland expedition funded by John Jacob Astor's Pacific Fur Company and would continue with the establishment of the Oregon Trail and California Trail.

The westward movement of Americans in th...