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Since Mexico is for this invasion of the United States it is an act of war which should be reponded to in kind.
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We annexed Puerto Rico, which was pointless. Why do we not just declare manifest destiny and assume control of Mexico? If they do not wish to act as a sovereign state, why not let us flush their corrupt system?
Mexico City built a wall to keep the US Army out. It didn't work !
Captain Robert E Lee, Lieutenant Ulysses Grant and many others who would fight against each other 15 years in the Civil War were all on the same side for the Mexican War, part of Manifest Destiny.
Here's an article on it but there are many books on the subject that are far more in depth. It's a Great Story
http://www.historyguy.com/Mexican-American_War.html