So, I am a big fan of historical realism and all that nonsense. I got a bright idea today that would bring an important element from RFC into Civilization V: historical spawn dates. Essentially just certain civilizations spawning in at the appropriate time. I was just gonna pick civilizations for certain eras (ie Ancient, Classical, Medieval, Industrial, ect) and spawn them in at the appropriate date. It seems as though I can only import a blank map into world builder and can't do any editing to the actual game. Anyone have any suggestions as to what I can do?