“What if Civil War II resulted in the same ratio of casualties to population as Civil War I?”
Your data is about right. However, your what if is irrelevant as casualties would not nearly approach 3.4%. Circumstances, demographics, etc, are much different. Nevertheless, even small armed clash’s of conflicting groups/militias will have major reprocussions for sure.
The Finnish Civil War in 1918 killed over 1% of the Finnish population in a little over three months.
Yes, there are an almost infinite number of variables which one reason I just did a straight "what if" based on numbers.
But who is to say if the ratio would be less or more today?
On one hand we do have far, far superior medical care which would greatly reduce deaths among the wounded.
On the other hand the advances in lethal weaponry are just as great, if not more so.
The killing power of a modern day squad equipped with automatic weapons, explosives and communications backed up by air power
no doubt exceeds that of multiple battalions 160 years ago.
Either way, the muslim hordes and others would love to watch Americans killing Americans by the thousands.