That includes preventing people from moving in if it comes to that. I'm not sure people contest that NYC can't do that, I think it's just considered a pretty b

That includes preventing people from moving in if it comes to that. I'm not sure people contest that NYC can't do that, I think it's just considered a pretty bad idea that also runs against a lot of American ideals. For example, we usually try to avoid the whole birthright thing. And, what a mess we'd have on our hands if (for example) when Detroit's economy tanked, every other city had closed their doors and Detroit residents effectively weren't allowed to go anywhere else.