Why are some of the territories gray? I mean, they are marked as 'unavailable' on the overview map.
I suppose they are countries that ceased to exist (lost countries), but why aren't they going back to green. One particular territory which got my eye is this one. It got such a promising shape and location for me, but unfortunately, it was unavailable, so I ended up with the 2nd favourite territory, which is the one I own now.
My question is: Why are they still gray, and how much time do they need to go back to green? Also, can I request them right now? (I DO NOT PLAN TO DO SO, JUST ASKING)