The significant treaty signed after the end of the Mexican-American War is the Treaty of Guadalupe Hidalgo. Signed on February 2, 1848, this treaty marked the end of hostilities between the United States and Mexico. Under its terms, Mexico ceded to the U.S. more than 500,000 square miles of territory, including present-day California, Nevada, Utah, Arizona, and parts of Colorado and New Mexico. In exchange, the U.S. agreed to pay $15 million and assume certain claims of American citizens against Mexico. This treaty significantly expanded U.S. territory and established the current borders between the two nations, profoundly impacting their future relations.