This isn't rocket science: just keep a database of legal people inside the city and don't permit shipping/ferry to anyone outside. The problem are toxic governments ruled by that desert tribe in the middle east which immediately treats any invader as prospective citizen regardless of their (crimina...

The Spanish seem to be suicidal even by the standards of EuroCattle, with the lowest birthrates and the most meek and passive acceptance of their own doom. No wonder their land is being overrun by Latinas from the colonies and expats like Alvin Tan, as well as Muzzies. At this rate Spain will go b...