I agree with this plan, I just don't want to see another nation roleplay turned into a war-based nation roleplay rather than force on writing good stories.

The Cold War idea is a good one, because the world was under daily threat of a nuclear attack by either side. Plus, the The Krakow Wall could be similar to the Berlin Wall or the Iron Curtain. And we could have something similar to the Space Race/Space Age. Or make up a event/age based on the Information Age or the Digital Revolution.