Yes, but it would have to be an extremely good politician like Reagan or FDR (and even they didn't achieve that, to my recollection) and the country would have to be less polarized on isses. When half of the country disagrees with the other half, 90% voting in one direction in any large area is unlikely.
The south was pretty polarized from the north from 1865-1960.
Yes, but that's one region disagreeing with the other. Currently the disagreement is more widespread and is not localized as one region against another, although certain regions are more tilted to one end than others.
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