[Iron Munro]

However, have you ever contemplated the cost of a civil war in the twenty first century? Something to think about anyway.

What if Civil War II resulted in the same ratio of casualties to population as Civil War I?

In that case the number of dead and wounded today would be more than 11 million.

CIVIL WAR I

US Population In 1860: 32 million (approx)
Civil War Dead: 625,000(approx)
Civil War Wounded: 475,000 (approx)
Total Civil War Causualties (Dead & Wounded) 1,100,000
Civil War Causualties As Percent of 1860 Population 3.44%

CIVIL WAR II

US Population In 2017: 326,000,000 (approx)
3.44% Of 2017 Population: 11,171,875

[snoringbear]

“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.