The Treaty of Guadalupe Hidalgo officially ended the Mexican-American War. The terms of peace set forth in the Treaty of Guadalupe Hidalgo were a catastrophe for Mexico and a triumph for the expanding United States. After a decisive military defeat, Mexico was forced to sell over half its national territory to the United States for the price of $15 million. The United States obtained clear legal title to more than 850,000 square miles of land, including territory that would eventually make up all or part of Arizona, California, Colorado, New Mexico, Nevada, Utah, and Wyoming.