Both the Mexican War and the Spanish War were a result of unfair treatment against weaker nations. The origins of the Mexican War lay with the United States and its expansionistic policies. Most Americans believed they had a divine right to bring their culture among others, because they were superior. This belief was put forth by Manifest Destiny, which had been circulating around the United States for a long time. The ignorance possessed by the Americans show no courtesy toward the Mexicans. …