I just recently had an unsettling experience with the Koreans. I was MPP'ed with China, and Korea was attacking China, so that was truly bad since it meant 20 turns of war for my democracy with me as the aggressor... in the end my war weariness had plunged through the roof, and I was running at some -400 deficit to fill the monster that was the entertainment budget. Korea was also abnormally big and rather powerful too, so it did take the full length of the MPP plus some more to eradicate the bastard. So I'm inclined to say Korea, although I've got a couple of scores to settle with Shaka and Hiawatha too.