See my post #504 about understanding master trends and profiting from derived events. There is no way the present configuration of the US is going to survive this demographic onslaught.
An arbitrary border was drawn across the Sonoran/Chihuahuan deserts not more than 160 yrs ago. On one side is the rule of law and respect for private property. On the other is a colonial oligopoly that can directly trace its lineage back to 1523.
Both countries are part of N.America - Mexico is rich with natural resources. On the one side is a thriving, advanced 1st world nation; on the other, a backwards, corrupt 3rd world country. When Mexican citizens come north, they are immediately put to productive work.
The only difference then between the two countries is the legal system. If we annexed Mexico and imposed our legal system, the resulting massive economic development would make make what's taking place in China look like the Depression era Dustbowl in comparison.
Something to think about. We do not intend to be taken over by that third world country. If we will go to Iraq to protect this country - we may have to go to Mexico to protect it.
And, it would probably be a lot, lot cheaper. But, hey, this is just talk - it will never happen. The dems would be upset.