Slitherine

I would love to see modern combat played out in the United States. I've played a bit of Wargame: Red Dragon and that system would work perfectly for war across the east coast. Fighting over dc or other major cities would be awesome.

Will the new Armored Brigade 2 not allow the creation of a Modern Civil War mod?

Combat Mission has some great tactical gameplay, but have you checked out the potential Armored Brigade 2 mods? That game tends to have a really active modding community, so there's a decent chance someone might create a US Civil War scenario.