Is it easy and has it been done? Has anyone ever made a mod where civilizations change over time... aesthetically and in other regards? Currently the only thing I see that changes by era is the music, and the art of units and buildings. What I would like to do is to change things further. How difficult would it be to change, say... flags by era? Meaning, is it possible to change a civilizations flag every time they enter a new era? Is it possible to change the civilization's name by era? Their leader? That leader's traits? These are all questions I ponder as I think about how to create a mod in which civilizations change over time. I'd like to see, "Northern Tribes" morph over time into "Russians". I'd like to see "Germanic Tribes" renamed in the industrial era to "Germany". "Celts" renamed mid game into "Ireland". "East Asian Tribes", into "China", and so forth. Each with a new flag and potentially a new leader (primarily for new traits). I'm not gonna ask if it's possible, because I'm sure it probably is. But is it easy and has it been done?