Suggestion- Division of Countries In-Game

I can't tell you how many times my allies and I have defeated valuable country (like Germany) and I end up with 1 city and the capital and my buddy has the other cities. It'd be so great if I could just divide Germany- just for that game so that we could both benefit from capturing the country. To improve balance, it would probably be best if this feature had an in-game cost using the in-game currency for the creation of a new capital and naming. I see it being similar to how during WWII, Germany was split into eastern and western bits and divided amongst the victors. Of course, these divisions would not be permanent, so if I say took control of the other half of the now split Germany, I could pay money to reunite the two portions.