If Mexico became a state the crime would cleaned up quickly. Mexico gets a lot of sunshine and has beautiful beaches and climate. The rich people in America would be pouring money into it and making it into their own oasis, as has been done to many parts of Florida. The government would be pressured into taking down the cartels. The rich and middle class would be moving into Mexico in large numbers to take advantage of the low col and cheap property. Even the poor would be migrating to Mexico for the new opportunity. It would essentially be the closest thing to a new frontier for America since the annexing of Hawaii.

In comparison to Canada or Greenland, it's a far better location to obtain.