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: -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-3: -The Treaty of Guadalupe Hidalgo, which brought an official end to the Mexican-American War (1846-48), was signed on February 2, 1848, at Guadalupe Hidalgo, a city to which the Mexican government had fled with the advance of U.S. forces.

Detailed explanation-4: -The treaty effectively halved the size of Mexico and doubled the territory of the United States. This territorial exchange had long-term effects on both nations. The war and treaty extended the United States to the Pacific Ocean, and provided a bounty of ports, minerals, and natural resources for a growing country.

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.)