Three to one

According to the latest data, the population of Mexico is just over one hundred million, and the United States just over three hundred million.
If the open-border advocates (or 'border obliteration activists' as Michelle Malkin put it) have their way (the 'it's just a region' observation about the juxtaposition of the two countries by Juan Hernandez, who was at the time was the minister of the Ministry for Mexicans Living in the United States, is a classic), a good percentage (let's say half, just for argument) of Mexico will come north looking to better themselves.
Rico's not against people bettering themselves; it's why most of the original immigrants to this country came in the first place.
But let's ask ourselves how this country will be even more different when we have fifty million Mexicans living here, let alone all the Central and South Americans who'd come in on their coattails...
That's at least 6:1 of the rest of the population. If you have the standard three people in your household, you'd also have a half a Mexican living there, too.

Rico says they can stay home. We have enough Mexican restaurants now...