Here's a hypothetical situation for you, arguendo in a world without nukes: China invades the US, takes over a couple of states, then a new leader of Germany is elected who will push to reduce any supplies coming in from Europe and will negotiate with China to end the war. Of course China gets to keep the few states they've gotten since they have a large Chinese population, fair is fair after all, we just want peace. Also China's demands include the US to demilitarize except for a small force, so they don't feel threatened by it, after all the US could invade them in the future otherwise! Oh well, all for peace I guess.