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Northeast Corridor, Southern California, Chicago/Milwaukee (is there a name for this?), and San Francisco/Sacramento make sense as larger, more coherent entities a step above a CSA because of a combination of physical proximity and easy and fairly common traveling patterns among metros within these corridors). Maybe Detroit with some of the smaller metros that are very close by, too. Southeastern Florida also makes sense (and likely would make for an even stronger argument once the rail line connecting all the cities is complete). Cascadia probably would become a lot more coherent as one entity if frequent high speed rail service is implemented.
I notice that the articles referenced do not include Jacksonville with the rest of Florida. The connections between South and Central Florida are about the same as Northeast Florida and Central Florida. CMSA for Jacksonville adds about 1.5 million people and a county in SE Georgia.
Coastal Florida is heavily developed, Flagler County which is part of the same CMSA as Orlando had a good number of people that commute to Jacksonville, its only 45 minutes drive. This links Northeast and Central Florida moreso than Orlando metro to places like West Palm Beach.
I voted Cascadia, only because there was no mention of NOT including Vancouver, BC. If you put Vancouver, Seattle, and Portland into this zone, then it is primed to be huge in the next couple of decades.
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