USA HISTORY

Detailed explanation-1: -Under the treaty that ended the Mexican War, most of the Mexicans who lived in the new United States territories became U.S. citizens.

Detailed explanation-2: -This treaty, signed on February 2, 1848, ended the war between the United States and Mexico. By its terms, Mexico ceded 55 percent of its territory, including the present-day states California, Nevada, Utah, New Mexico, most of Arizona and Colorado, and parts of Oklahoma, Kansas, and Wyoming.

Detailed explanation-3: -Under the terms of the treaty negotiated by Trist, Mexico ceded to the United States Upper California and New Mexico. This was known as the Mexican Cession and included present-day Arizona and New Mexico and parts of Utah, Nevada, and Colorado (see Article V of the treaty).

Detailed explanation-4: -The Mexican Cession (Spanish: Cesión mexicana) is the region in the modern-day southwestern United States that Mexico originally controlled, then ceded to the United States in the Treaty of Guadalupe Hidalgo in 1848 after the Mexican–American War.

Detailed explanation-5: -Residents had one year to choose whether they wanted American or Mexican citizenship; More than 90 percent chose American citizenship. Others returned to Mexico where they received land. (In some cases, they remained in New Mexico as Mexican citizens.)