I'm puzzling with what wins wars. I've heard the argument about having unbreakable provinces being a factor, but it conflicts with my idea of having a balanced KD.

I see two ways of getting unbreakable provs. Have a prov/provs:
1) a lot bigger than the rest pumping up kd NW
2) defence pumped so much that tpa/wpa/off as a result is lower.

I see neither as a big advantage. Perhaps 1) can get a better economy and help out the KD that way.

So what are your thoughts on the matter?