Join 'gathering' upcoming events being held in Guadalupe Hidalgo. Guadalupe Hidalgo is a historic district located in the fringes of Mexico City, famous for being the site where the Treaty of Guadalupe Hidalgo was signed, marking the end of the Mexican-American War in 1848 and the cession of present-day California, Nevada, Utah, most of Arizona, and parts of Colorado, New Mexico, and Wyoming to the United States.