Treaty of Guadalupe Hidalgo (1848) The treaty of Guadalupe Hidalgo, signed on February 2, 1848, ended the war between the United States and Mexico. By its terms, 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. The Treaty of Guadalupe Hidalgo, which brought an official end to the Mexican-American War (1846-1848), was signed on February 2, 1848, at Guadalupe Hidalgo, a city to which the Mexican …showed first 75 words of 318 total…

…showed last 75 words of 318 total…negotiate. Trist determined that Washington did not understand the situation in Mexico and negotiated the peace treaty in defiance of the President. In a December 4, 1847, letter to his wife, he wrote, "Knowing it to be the very last chance and impressed with the dreadful consequences to our country which cannot fail to attend the loss of that chance, I decided today at noon to attempt to make a treaty; the decision is altogether my own."