Crusader King III

Crusader King III is a great game to learn how those web alliances quickly bring about world war over the dumbest. I always thought about that with old, tiny alliances. What's your alliance? Yeah, we're with those guys. If you attack us, those guys are going to join. And then if they join, there's somebody across the world that might join because they're allied through a marriage between King and Potter. There's nothing you can really do about it.