OK, your bloodbath is realized, the borders are sealed in your mind. We have, in MY estimate, 7 million or so illegally resident aliens. How do we find and shoot them?
The Majority would pack up their bags and leave. The rest would be rounded up in due time.
The fact is that if we get tough, then those who come legally through the border crossings and pay the fees, will rat out the illegals IMHO...Further we should get rid of the black market by abolishing the income tax...and instituting a national sales tax...That will level the playing field and destroy the incentive to use paperless workers.
I have no problem whatsoever shooting dead anyone who invades my country...you got a problem with that?