Oracle1 is correct.
These are a people who sadly possess an inferior culture and a huge I.Q. gap of 10 points (more for the bulk of indigenous poor Indians being pushed al Norte by shrewd 5% Spanish descendant controlling gov't policy-makers in Mexico City).
These folks (most of whom are semi-literate and have less than a 6th grade education) have destroyed Mexico's once unlimited potential (good climate and excellent resources).
Most are serious Leftists/Big Guvment lovers weaned on socialism.
And we are supposed to welcome them into an Anglo nation, with an economy based upon education, information/knowledge and technology? Madness!