New York? Chicago? You sure the differences between then and now means that what worked then won't work now? Based on what?
Well, let's start with the fact that you're mischaracterizing what existed...
This whole idea of debating future policy based on the 'lessons' of the past has never interested me all that much. And a couple of nights ago, I think I stumbled on why that's the case.
I've been reading a book on free will (
Freedom Evolves by Daniel Dennett, if anyone cares). One passage in particular was something of an epiphany for me. The author was making the overall point that one reason free will is such a difficult issue to sort out, is that our assumptions about it, perhaps even the ways we define it, are incoherent.
He pointed out that we tend to think of the past as a fixed entity, that because it's 'already' happened, we can pin down exactly the series of causes and effects that created the current situation. We look at the future differently though. We conceive of it as an open book that is ultimately 'undetermined'.
But the irony is that, under close scrutiny, things are actually the reverse. Even if we knew all the facts about he current state of the universe, we can't say with certainty how it got that way. That's because any number of possible pasts could have created the exact same current state. Ultimately, all we can do is make some educated guesses on how things were and how they played out. The future, on the other hand, is a actually easier to know - in theory at least. If we know the state of things now, and have a solid (if not complete) understanding of the laws of reality, we have a decent shot of predicting the future.
Anyway, my epiphany, and the point I'm making, is that using the 'facts' of the past to support our preferred philosophical narrative just isn't as reliable as we like to think. All we can do is look hard at the way things are, and use our understanding of the way reality works to lay out a course. Obviously, our 'understanding' will be colored by our assumptions about past events, so I'm not suggesting blindly ignoring history. But it's hard to use it to really prove much that applies today.