Which was the same in all Greek city-states?

military service

gods and goddesses

citizenship

the laws

Greek city states believed in gods and goddesses

Explanation

Dorians were the first to control Greece but they were chased out of Greece when they lost to the Greeks and the city states were formed. There was no Central government which controlled all the states unanimously. City states considered to be separate and the people residing in each sate considered to be the citizen of the state first. People of Corinth considered to be Corinthians. People were free to move from one city states to another and they can settle there permanently.

United states have religious freedom and people worship in a different way But in Greece, people believed in same gods and they believed them naturally without anyone forcing the religious beliefs on them. They spoke the same language and they share the same culture in all city states.