Good post JTF
Interesting point about the unofficial northern boundary of South Florida more or less being at the Palm Beach-Martin county line, which matches what I've read and heard over the years
From all my time up in this part of the state, I feel like the "southern boundary" of North Florida would include Daytona Beach, then pretty much mirroring SR 40 through Ocala before making way to the Gulf Coast at Cedar Key (which as state history nerds know was the ending point for the Florida Railroad that begin in Fernandina Beach north of Jacksonville but was derailed during the Civil War).
Always felt like Daytona and Ocala — specifically the areas the that have been around while — very much have a Southern feel.
To me, the vibe changes noticeably when you starting head down I-95 or toward Orlando or Tampa.
Those places don't seem like the South at all to me.
Wow, what a topic. I think I basically agree with you.
Without getting into too much detail, my thought is that once an area becomes excessively urbanized (or suburbanized), it loses a larger "regional" identity and then either becomes 1) generic; or 2) develops a localized culture instead. I'd argue much of South Florida has a localized culture, distinct from the state, the South, or even the United States at large. It's highly unusual.
Even in South Florida, "below 595" you'll notice a difference from above it, and "Down South" (def below 152nd street) in Dade you'll notice a change again as you get further from the City of Miami.
I find Southwest Florida to be more "generic" than South Florida, although some will disagree.
The City of Orlando I don't find particularly "Southern," although many of the suburbs I do find retain that character. I'd say something similar re: Tampa, but Seffner and Plant City feel like the South to me. Again, though, it all goes back to what I think about urbanization in general.
Now, when people start saying that an area is "too Catholic" or "too Latin" to be the South, I think that's a weird argument. I definitely don't believe you have to be an Evangelical.
This is basically what happens after a century of non-stop housing development, immigration, internal migration. The only constant is change.
It's easy to get off on a ton of tangents, so I'll try to not write a book, lol.