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Another way to think about this question might be "What US territory is closest to the equator." There are definately better options that Florida, but they are outside the continental US. Obviously using these sites is a bit of a trade-off since it's not as convenient to the rest of the industrial base.

Here are the latitudes of some possible alternate sites:

Cape Canaveral: 28 degrees N.
Hawaii: 21 degrees N.
Marshall Islands: 9 degrees N.
Baker Island: 0.11 degrees N.

Baker island looks best on paper, but it is just a tiny nature preserve, not really practical for rocket operations.

I'm willing to be corrected on this, but I don't believe the Marshall Islands are a US territory.