http://michellemalkin.com/2008/07/09/15-things-you-should-know-about-the-race/

I've said long ago that if a group of Americans went to Mexico and demanded these "rights", they would learn a valuable lesson in how Mexico deals with people who are in its country without permission ... oh wait, here's a video. (4 min)

In other words, when the situation reverses and the Americans need to "go there to do the work that Mexicans won't do" (well, more likely, do the jobs that are no longer in the U.S.) they will find our southern 'vecino' to be far less accommodating than we were.