i would like to see it tied in with civil wars also. distant colonies on other continents declaring independence, perhaps some civs could be in a class called colonial born; so that when a distant colony decides it has had enough of rule from overseas (some unhappiness check particularly with culture and ideology modifiers) it can either become a set of CS or if conditions are right it becomes a civ randomly picked off the colony list like the United States or Brazil. as ruler you would get a notice of the declaration, and be able to either give your blessing and remain head of state (which would be permanent alliance with the new colony as in the team system in the setup); or allow them complete independence - you start off with extremely good relations but it becomes just like any other civ. or you can deny it and then they remain part of your empire but many of the military units become hostile. the way i see it working is; the land remains part of your borders but the cities become the color either of the civ they are going to be if they win the civil war, or of the CS the city will become. they CS/rebellion can get allied with other civs who can provide units to them just like the gifting. in addition all military units garrisoned in cities make a check and if successful go to the rebel/CS control. they are hostile to units which dont make a check who are ejected from the city they were in, and replaced by some militia type home defence unit (could just use scout for this). workers also have to do a check to determine sides. if none of the loyalist military units can get to the land controlled by the rebel city within say a fixed number of turns then the land worked by a rebel city before it rebelled also changes to that CS territory or newly independent colony. rebel units can also reclaim the territory by moving onto it. for example you had a unit fortified within 3 hexes of the rebel city before it declared its freedom from you, but you hadnt moved it to try and retake the city then the rebel unit if it marched from the city to attack you, would leave a trail of liberated tiles behind it. if you moved the unit out of the tiles originally worked by the city the rebel unit returns to it and begins to claim all the territory immediately around it for the city, until after 5 turns all the land originally under that cities control before rebellion suddenly reverts due to not being contested.