Because Mexico has no economy or infrastructure and corrupt govt, drug cartels etc, I mean I’m not saying the U.S. is not corrupt but not in the way Mexico is, plus people also come from Guatemala, El Salvador and other Central American countries they simply through the Mexican border, and the ones that come to America are generally a self selecting group meaning they have better work ethic and determination that other inhabitants of their country.
The ones who come here are the ones who could not hack it in their own country, they are the 3rd world dregs
Hispanics are not the only illegals who have come into this country, the next largest group is quite likely from the middle east and THEY scare me more than hispanics.