I believe that this game would benefit a lot if Civilizations would expand their borders and only build within their borders unlike now, where they build stuff everywhere and make whole game confusing as to what land belongs to whom.
Typical example is when 2 human civs start near eachother and build their stuff everywhere to the point you dont know what site belongs to which civ. Throw in sites from other civilizations/necro towers and you dont know anymore what belongs to whom. Thus borders would really help with this along with some kind of notifier that tells you in which civ lands are you when playing ADV mode (Would help identify captured sites).
This kind of system would also make some interesting situations where surrounded civilizations would be unable to expand more, resulting in variously big empires throughout the world. Being stuck in small place could also lead to wars in order to get more natural resources or land and maybe lead to site razings in order to replace, for example goblin pits with human hamlets. Anyways what you guys think about this?
The sites already have defined borders. The sites have defined owners, when we have a lot of sites in close proximity then we have a clear continous territory along the lines that you are talking about, sites tend to be built in close proximity to existing sites so no real problem.
Wars currently start 'due to disputes over land rights' which doesn't mean much right now, but we'll probably start to see some kind of border/sphere of influence system when laws and property rights are introduced during the Scenarios arc.
The problem is the site limit limits the number of sites that are created. Since creating new sites is forbidden after a certain point for memory reasons, it does not make sense to fight over ownership of wilderness which cannot be built on. A better option might be to allow sites area to expand so that two sites can potentially clash over the wilderness land in the middle as they grow, that would create a situation that has to be resolved, civilizations that are on bad terms fail to resolve problem hence conflict. The outcome of conflict decides which site gets to expand into the wilderness in the middle; the weaker a civilization is and the more a believes in peace, the more readily it is to resolve a conflict by simply giving in.
When site creation is still active we can have two civilizations place a site on the same location accidentally and conflict results. Neither site is built until the conflict is resolved and the loser/cave-in has to choose a different location for their site.