The reality of the situation is that sometime in the future the US will eventually absorb Mexico. The Southwest US is not going to 'secede'; rather, the tens of millions of Mexicans who have become Americanized will move to annex their former country.
Agree with your points regarding the flow of populations and the militarization of the border.
What happens as a result of the influx? My guess, not much...Mexico stays Mexico and the US keeps it's borders.
>>>"No civilization/culture in all of recorded history has been able to stop/prevent migratory flows"
1) North Korea... nobody leaves.
2) Switzerland... only the rich get in.
3) Germany... those Jews who didn't emigrate were slaughtered.
4) Mexico... ever try to walk into that country illegally?
5) Any South American country... ditto.
6) New Zealand... has rational system and they stop illegals.
I'd have to say there are many countries throughout history that refute your claim.
Hoppy
"rather, the tens of millions of Mexicans who have become Americanized will move to annex their former country"
What former country, the wind, sand and a few tumble weeds?