>>67983
Borders define themselves. Even in South America there is de facto segregation. The richer suburbs are whiter, gated and patrolled by private security firms. The poorer suburbs are darker, but they exclude outsiders with violence and turf wars. It's like that the world over.
If AnCap kicked in overnight, there would be no federal enforcement of borders. Immigrants would flood in until, I imagine, they reached communities who forcibly stopped them.
>>67986
It's their problem when they try to immigrate to a community that forcibly excludes them. It wouldn't break the nap because there would be a gigantic sign saying immigrants not welcome. The fortress walls would also make a statement.