I have an idea about how to simulate World War One. Start the game right before the war with all people in the alliances they will be in beginning the war (except United Kingdom) then make an event where the assassination happens. This would give Austria the chance to declare war or not (choice A would be declare war), then have where Russia, Germany, and France enter the war on their sides. Then a little later have an event where Germany try to take its troops through Belgium and England is forced into the war. Then make events for if each allied country (except Russia) is taken they loss the war, and if Germany and Austria do not win the war by the date the war ended they loose, and of course if Russia does not win by the time the revolution happens they loss. The AI would have to be set not to surrender (we can do that right?). Basically this would force every country into the war through events. All allied countries loss if their capital in taken, and all central powers loose if they do not take the capital by the end of the game.