Alliance map
Everybody knows that every alliance in the game usually has at least one war going on and also has several peace treaties. Well my idea is that if your going to war with another alliance you can have a feature that let's you declare a war on an enemy alliance. After you do that, you will see every known enemy city on the map orange. It saves you a lotnof time looking for their members. Also they will automaticly see your citys orange as well so thy it's not unfair.
If this happens, you will of course need a way to stop the war afterwards so that members don't keep attacking other members of the other alliance. So their should be an "offer peace" button that will send a message to the other alliance. If they accept, you will stop seeing their cities as orange and they will stop seeing your cities orange. If they don't accept, well the war continues and nothing really happens.
Another idea I had that adds on to this one is that you should be able to see allied alliances in a color like blue. This will help so that nobody accidently attacks someone they shouldn't. It will help keep friends being well friends.