I think it was Salinas president of Mexico twelve years ago that first proposed Mexico as a nation without borders. A Mexican Diaspora. If not him it was Zedillo who followed Salinas in 1994. Nevertheless at about the same time Jagdish Bhagwati's campaign for a World Migration Organization began. Father of the Bhagwati Tax Proposal it sought taxation by source country; i.e., the extension of income tax jurisdiction to nationals abroad.
This is from an article at
http://gurusonline.tv/uk/conteudos/bhagwati.asp
The article states
"Thus, schemes to encourage remittances are implemented. Dual nationality is increasingly granted, to cement the emotional and practical bonds with the home countries. India and Mexico have embarked on a massive effort to integrate their citizens abroad with their home countries. I [Bhagwati] have proposed for some decades now that the Diaspora must be given both more rights (such as dual nationality) and some obligations. The obligations would primarily include taxation by source country" [end excerpt]
Professor Jagdish Bhagwati is at Columbia U.
IMO this is not about tired, hungry people looking for opportunity. In Mexico's case it's about a corrupt, criminal class exploiting its citizens AND, with our own often corrupt sometimes criminal polticians, exploiting American taxpayers.
ILLEGAL immigration ain't just happening. It could be stopped if our ruling class wanted it stopped.