In the Mexican War, Mexico was more responsible for starting it. Many events led up to the the Mexican American War, but at the end Mexico did many things to start the battle. The Mexican War was mainly driven by Manifest Destiny, but besides that fact, Mexico trespassed on the US lands, repeatedly ignored our compromises, and produced tons of guerrilla attacks on the US. In 1844, James K Polk became the president of the United States. He later campaigned that Texas should be re-annexed and also set his eyes on New Mexico. This news did not go well with Mexico. Mexico denied the request for Polk to purchase the New Mexico land, and so Polk grew furious he instigated a fight by moving troops into a disputed zone between the Rio Grande and Nueces
