An interesting post from a comment on a WP article on immigration:

[Voltaire2]

8. The WOD has caused most of the ongoing political instability.

It hasn't stopped. We are the primary cause of the emergence of narco-states and the disintegration those states trying to prevent their emergence. The political instability of the 1980's was us again, destabilizing any government we decided was too socialist to tolerate.

Actually shutting the border down would not only crash the Mexican economy, it would severely damage our economy and undo the effort to move some of our global manufacturing out of China. It is simply a stupid idea.