As the Army occupied most of Mexico's major cities, Mexico had no choice but to accept the American terms. The new territory acquired in the treaty included all or part of the present day states of California, Nevada, New Mexico, Arizona, Texas, Colorado, Utah, and Wyoming. The Mexican-American War: The History of the Controversial War that Resulted in the Annexation of the Southwest and California looks at the controversial war. Along with pictures of important people, places, and events, you will learn about the Mexican-American War like never before, in no time at all.