No one has any idea of how many Mexicans there are in Mexico. Since 1965, about 25 million have come here that we know about. In addition, I would guess (and my guess is just as good as the government's, maybe better)there are about 25 million illegals presently here.
Bottom line, right now, there are probably getting to be about 100 million Mexicans in the Unites States, give or take 10 million, legally, illegally, or the offspring of same. I would be delighted to be proven wrong, but I and the highly paid technocrats of my government are, scientifically speaking, just not far apart in ignorance of this fascinating subject because of the illegal immigration question.
Any attempt, well-meaning or not, to compare Mexican immigration to any other previous immigration is fatuous in the extreme.
Una pinguitillita.