Who would fight in such a “civil war”? What sides would develop? Law enforcement will crush anyone who opposes Globohomo/Antifa. Most of the population has been turned into tubs of drugged-addled lard, probably by design. There will probably be a lot of street violence, but no actual civil war.
In my opinion it might not be possible for civil wars to spark off when the poorest are the most likely to be obese and are the most entertained poor people ever. They are also generally unused to hard physical labor outdoors in all weather. These conditions have never existed before, and are fairly new. So I guess the counter argument is that there is a first time for everything.
Also, you would think more would simply try voting before they take to the streets and choose the hardship that would come with participating in sustained civil unrest. Eligible voters who choose not to vote in presidential elections outnumber the turnout of either political party.
Freegards
What would happen in the big cities would be much different than what would happen in rural areas or Fly Over Country.