Which of the following was a result of the Mexican American war?
1) The Treaty of Guadalupe Hidalgo was signed, resulting in Mexico ceding a large portion of its territory to the United States. This territory included present-day California, Nevada, Utah, Arizona, New Mexico, and parts of Colorado, Wyoming, Kansas, and Oklahoma.
2) The Rio Grande became the border between Mexico and the United States.
3) The Mexican Cession, the land gained by the United States from Mexico, sparked debates over the expansion of slavery into the newly acquired territories.
4) The Mexican American War also played a role in the outbreak of the American Civil War, as tensions between the North and the South intensified over the issue of slavery in the newly acquired territories.