Game Idea: City-states Unifying to Become a New Rival/ Civs Fragmenting into CS

[swimandciv]

I think that whenever city-states gain independence they should have social policies that are different from the civ they are breaking from. i.e. if the main civ has piety then rationalism for the new civ. It would be similar to how in history most revolutions are accompanied with major social changes.