With an increasing polarization of American politics and underlying cultures, the chances of a 2nd American Civil War appear to be increasing. This op assumes that rather than two specific regions embattled, it would be Social Democrats vs Republicans. (Arguments against this premise will be ignored.) It is admitted here that how the US armed forces took sides and, barring that, how foreign powers took part could decide the outcome. So those factors will be set aside.
To begin looking at such a conflict, a good place to start is a voting map for the recent 2016 presidential election based on precinct level voting:
And one weighted for population numbers:
As even the most casual political observers would anticipate, many of the large urban areas have a high density of Democrats, while much of rural America is less populated but heavily Republican.
Many other factors to consider, including:
Polls suggest that most retired military officers may be Republican, while retired combat troops are pretty evenly split.
More Republican's own guns than Democrats, and the Democrat gun owners lean towards hand guns rather than rifles.
The Democrat controlled urban areas may have more industrial capacity, but I think they'd have a real problem keeping people fed.
Considering only the above items so far, I'd lean towards Republicans to win in a terribly bloody and prolonged battle.
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