you could argue it is a form of apartheid: manhattan and the san francisco peninsula are classic constrained square miles with limited access points. The walle

you could argue it is a form of apartheid: manhattan and the san francisco peninsula are classic constrained square miles with limited access points. The walled City of London, a separate sovereign maritime nation situated within London is another historic example... https://www.ft.com/content/7c8f24fa-3aa5-11e4-bd08-00144feabdc0 https://www.ft.com/content/7c8f24fa-3aa5-11e4-bd08-00144feab...