USA HISTORY

Detailed explanation-1: -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-2: -The Mexican-American War reopened the slavery-extension issue, which divided the North and South and which had been largely dormant since the Missouri Compromise.

Detailed explanation-3: -It paved the way for so many other important events, from the expansion and dispossession of indigenous people, the California Gold Rush, and American Civil War. It added the states of California, Texas, New Mexico, Utah, Arizona, Nevada, and parts of Colorado and Wyoming to the United States.

Detailed explanation-4: -The acquisition of lands from Mexico in 1848 reawakened debates regarding slavery. The suggestion that slavery be barred from the Mexican Cession caused rancorous debate between North and South and split the Democratic Party when many northern members left to create the Free-Soil Party.