Stalingrad. Interresting that your only example from history is a city that had already been under totalitarian PHRASECENSOREDPOSTERSHOULDKNOWBETTER. control for a generation, and had been under the Czars for a long time before that.

What most people are really worried about but are afraid to describe is the unleashing of the racial tensions fueled by our unique American history. We would have the gangs, and the angry blacks, and the marxist liberators, and all the other opportunistic "poor" who are flat out convinced that "we" have been withholding the good life from them for the last X generations and it is payback time. This does not even consider the possibility of either muslim, mexican or chinese incitment and sabatage that some conspiricists propound.
In Stalingrad the marxists had won a generation before and the city was homogenized already, rabble rousers ruthlessly stamped out.

Few if any historical precidents exist for modern western society.