If you’re talking about Ancient Greece then...
The two most powerful city states were Sparta and Athens. Sparta was the strongest and most powerful city state with many soldiers and a huge army. It was only interested in fighting wars. Sparta united surrounding villages and sent armies to conquer its neighbors and bring back slaves.
Athens, on the other side, concentrated on trade , science and other fields. It was the first city to form a democratic government.
Hope this helped :)
