Ironically, a little Mr.Reagan put this idea to the test. Back in the 1980s, he granted full amnesty to the illegals living in his state. Then once he left office, the state completely flipped and never went back to being Republican.
Not everybody that comes over is an illegal and even then people vote for whoever has their best interests at heart.
The failure of a multicultural society is that people vote based on ethnic or group interests.
There's never been a switch or parity.
That has to do more with tax breaks than anything. I live in the area, I can say most of these AMERICANS with Mexican parents don't vote or care. Why should they, all these people are crooks anyway. It is usually the middle aged people and older that actually vote.