That depends. If the Muslims convert the Mexican population there then our situation would be no different than Europe.
The Muslims are not likely to convert the Mexicans without forceful coercion. What the Mexicans, who have embroiled us in so much anger recently, need to understand is that, if they want to become US citizens, they must be done with Mexico, just like our forefathers were done with Germany, or Poland, or Ireland when they chose to live here. The must assimilate from the second generation on like every other group has.
The problem is, the US culture is now so splintered into subgroups now that there is no way to justify to the immigrants that this is the correct process. They can live here in our bounty, skim untaxed money off the top, and yet remain completely loyal to thier land of origin. There is no good end for America as a nation to that scenario...
yup.