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The war between the United States and Mexico was the second time the United States engaged in a war of conquest, the War of 1812 arguably being the first. In the course of the war, the United States opened new political and social debates regarding the territorial expansion of slavery. The newly conquered territory with its Spanish or Mexican population witnessed dramatic social changes that turned residents of the new territories into second-class citizens. In Mexico, the war increased the perception that things had to change in order to provide Mexico with a national identity and a stable liberal government. Both countries underwent significant political and social changes.

Background

The origins of the conflict lay in a series of social reasons. In the United States, a steady ...

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