New Mexico is a U.S. state in the American Southwest. New Mexico borders Arizona to the west, Colorado to the north, and Oklahoma and Texas to the east. New Mexico was won by the United States after the Mexican-American War; prior to that, it was inhabited almost exclusively by Native Americans and Spanish colonists. New Mexico was the site of the Trinity nuclear test in 1945. New Mexico has a growing Latino population due to its proximity to Mexico. New Mexico's capital is Santa Fe, the oldest state capital in the U.S., and its largest city is Albuquerque.