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Causes of the Mexican-American War Where the blame lies for the Mexican-American War is hard to define. The westward movement of Americans in response to manifest destiny has been established as the ultimate cause of the war. Certain parts of North America were simply "destined" to become part of the United States. However, it is important to examine surrounding issues and other possible causes. Many believe that President Polk, with his aggressive promises and desire to gain California at all costs, was the main cause of the Mexican-American War. However, looking back to the previous term, signs of war can be seen with President Tyler as well. Tyler, being unpopular with both the Democrat and Whig parties, believed that by connecting his name to American expansion he could gain respect. He ran for a second term hoping to realize his dream, but Polk won the election instead. In one last attempt, Tyler sent messengers to Texas on the last day