City flipping without use of force.
I'm not completely for it, but I think it could happen. What might be more historically accurate are break away cities turned separate state, such as (off the top of my head) Taiwan, Korean peninsula, Yugoslavia, Soviet Union, Sudan, etc...
...however, unhappiness can lead to rogue--barbarian units--appearing outside of your city so this might make the break away state feature unlikely.
I'm not completely for it, but I think it could happen. What might be more historically accurate are break away cities turned separate state, such as (off the top of my head) Taiwan, Korean peninsula, Yugoslavia, Soviet Union, Sudan, etc...
...however, unhappiness can lead to rogue--barbarian units--appearing outside of your city so this might make the break away state feature unlikely.