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If I had to guess I'd say Seattle. They have the density, traffic base, and geography for it more than any other city. I'd also throw out Houston as a possibility - when it grows more and the core steadily densifies subways will become more attractive. One of the big cities in Florida is another possibility, since they have more density and people and less land. If it was growing I'd say Chicago would be the best candidate - frankly, I'm shocked that they never built a subway system considering the size and density of the place. American cities have surprisingly few subway systems, considering the size and density of cities abroad that have subways. You'd think that if cities that aren't that big or dense like Sofia, Helsinki, and Catania could have subways surely any American city bigger and denser than Nashville could.
I tend to agree with the notion that any city with a well-developed transit system and some heavily-used light and/or heavy rail is a great candidate for a new subway system, and short of that not so much. I think the primary problem is a general and systemic lack of will to invest in big projects that will make people's lives and transportation better. Just a third of the current annual military budget, for example, which isn't even equal to the extra post-2001 spending, could fund 1500 miles of new subways.
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