you dont .think of it this way,troy was a greek city but it wasnt run by a greek king it had its own leadership,it was a city state not till alex did it come under one rule
i guess i need to revise this if you have only played civ iv you wouldnt get this but what i had in mind was a more organic way to populate the world in the other civs if you werent running your city right you had population pissed at you and refused to work,so my thought was they should split from the city and astablish a new city even though they were the same nationality inthe early history this is what happened and how greece and the other mesopotanian civs were mostly city state.not untill representation ie.the republic was established that this changed