There are many reasons for why America was justified in going to war with Mexico. The Manifest Destiny stated that the U.S. should own all territory between the Atlantic and Pacific Oceans, which also meant that the expansion of the U.S. was inevitable and justified. Since Polk was also a very strong believer in the Manifest Destiny, it meant he would fight for the land the U.S. deserved. “Although the United States had no shortage of unoccupied lands, expansionists argued that the republic must continue to grow in order to survive....” This quote states that the Americans were dependent on land because they needed more room for the growing population.The Americans also had a belief that they were better than the Mexicans. Mexico was hostile
