Do you have some stats on Mexican emigration and population figures?
My guess is that their population is still growing is why they can't accommodate them all.
Another argument for the Electoral College.
I don't have any handy stats on that --- but massive migration of people out of Mexico is actually making things worse in Mexico. Abandoned women and children --- children raised without parents, villages where virturlly all the working age have left and all that remains are the very old and very young.
Mexico has a tremendous problem with abandoned children living in the streets of all it's cities and most of it's towns. It's imploding --- and we might think we're preventing problems with allowing unlimited numbers to come here but it's really just making things worse. Massive migration of people results from instability but it leads to more instability --- and it's the injustice in Mexico that is driving this.
In about ten years, Mexico's fertilily rate will be down to 2.1. It is about 2.4 I think now. The problem now is not so much an exploding population, but a population with enough skills that those skills are highly marketable in the US, with an internal support infrastructure in the US, and an economy in Mexico still so dysfunctional due to corruption and portectionism, that the wage gap remains huge. In any event, in about 15 years, I suspect threads will be more about the Asian influx, particularly of the Muslim variety, but in general, and little will be posted about Hispanics. Europe has a huge appetite for them anyway, and it will not be long before that continent absorbs the majority (it might be near 20% now). Give that one maybe 10 years.