It could range from democratic republic's, constitutional monarchies, military regimes (or even some sort of futuristic military society where war is essential to the state and every being but is not necessarily authoritarian, in the sense that every citizen fells obliged to follow/fight for the good of the nation), a pseudo-communism, a religious cult with a priest/shaman leader etc.
All of these should have an effect on the citizen's with ideals spreading or disappearing.
For example a democratic falling because of its failures in certain areas to be replaced by peasant communism, that then was lead by an authoritarian leader or just fully libertarian. Or a military society removing their leader because of constant military defeat, replacing him with another. A religious shaman being overthrown by the apparent divine messiah of their religion.
All of these can go on with or without the players help, or even being stopped by the player.
Would certainly add to the diversity of the game with sometime democracy being achieved in all realms, or then empires built from monarchs.
If government buildings: parliaments politburos, congress' being added also.
Just brainstorming but it would certainly be something that I would be enjoy in the game.Though i'd just share it..........