This map was presented during US President James K. Polk's annual message to Congress in December 1848. It shows Polk's vision of how to divide up the new territory acquired through the Treaty of Guadalupe-Hidalgo, at the end of the Mexican-American War. Mexico ceded 55 percent of its territory, including parts of present-day Arizona, California, New Mexico, Texas, Colorado, Nevada, and Utah, to the United States.