I definitely think a Kingdoms-style expansion is the way to go. As for which wars to include, I think it should be:


7 Years War

Peninsular War

Great Northern War

English Civil War




I honestly think the American Civil War would be absolutely awful. I mean, there's only two factions, the weapons are far too advanced for Total War to still be Total War, and it's just not as interesting as you probably think.




Spoiler Alert, click show to read: 
Besides which, they'd struggle to convince Kevin Costner to do a voiceover for it.