In 1848, the United States was vitally interested in the western territories of the continent that eventually became California, Nevada, Utah, Colorado, Arizona and New Mexico.
The United States had just forced a defeated Mexico into the Tready of Guadalupe Hildago to end the Mexican-American War. An 1848 map of the region published for the United States Senate is in the collection of rare and unusual items at Lighthouse Books, ABAA. It shows the territory contained in the Mexican Cession.
