The main causes of the war relied in the issue of slavery as well as the right of the states to be part of a federal entity with equal rights and voices. The implications for this war were enormous as it provided a different future for the colonies and for the U.S. As a whole.

The main cause of the war was, as stated, the issue of slavery. In this sense, the Mexican war played an important role. It pointed out the importance of the slavery issue even in an apparently international situation. The Wilmot Proviso is essential in this way. Thus, it represented an additional act to a bill that enabled the U.S. To satisfy the financial needs of Mexico. The act in itself however was not passed because it pointed out the fact that none of the territories acquired during the Mexican war should be opened to slavery;...
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