We could think even bigger and take all of Mexico. We would just need to supply the drugs cartels with enough guns and money to stage a coup on Mexico City. If Mexico City falls to drug lords then we could invade and restore order and we wouldn't be invaders at that point we would be heroes.
We could then deport everyone on Mexico who has a criminal history, which is basically everyone on Mexico. To like Guatemala or something.
Just a few thoughts.
We can take care of the drug cartel problem that Mexico has if we're in Mexico.
Remember what Bush did in Panama, regarding Noreiga and drugs? We sent the military in, and chased him around and caught him.
We could send military in and catch those drug cartel folks.