No research other than Wikipedia. That’s where I got the info on the middle east nations. Was hoping someone could break down some other alliances: for instance, invade x country and these countries had agreements to go to war, etc.
I’m not looking as much for house rules here, but more of an actual historical question. Not as much “you should have this happen when you invade a country” but more along the lines of “this country had an agreement to go to war with these countries should they be invaded.”