The right would lose because the American right is incapable of accepting their faults or accepting defeats and learning from them. They are too dissociated from reality to ever engage in real world actions let alone war. The American right lives off their ego that they sustain from never ending copes claiming that when they lose they actually win, or that they weren’t ever trying to win. The “civil war” is just another cope, a way they can psychologically deal with the fact they’ve lost on everything else. Why would the left start a civil war when they’re already destroying you in every aspect?
This isn’t to say there’s anything impressive about the American left, just that it’s not as useless as the right. They actually have street movements, pressure groups, social centres, legal support, media power and economic power. You do not.
Civil Wars are not sudden game changing events that come out of nowhere. The combatants don’t immediately find each other to form a fighting force. They are all prepared before the fighting really starts and right now the right has nothing prepared, not even social circles to recruit from. The likeliest war of the future will not be a grand full scale war of standing armies it will be tit for tat, neighborhood vs neighborhood political terror such as was in the Years of Lead or the Troubles.