I think this comes from a flawed perspective where ancient states are seen as rather monolithic. Rome had various iterations that were very different from each other, had it's revolutions, its border changes etc. Just like for example modern France with its various republics and revolutions.

Sorry, we don't allow throughout history questions. These tend to produce threads which are collections of trivia, not the in-depth discussions about a particular topic we're looking for. If you have a specific question about a historical event or period or person, please feel free to re-compose your question and submit it again. Alternatively, questions of this type can be directed to more appropriate subreddits, such as /r/history or /r/askhistory.