What were four factors that unified the greek city-states?

religious beliefs
language
government
literature
family relationships
olympic games
topography

The four factors that united the Greek city states were:

Explanation:

The above for factors unified the city states.

The people in each city state however had loyalty to their own city state that they refereed to as polis.

The Greek shared a language and refereed to those who did not speak their language as barbers.

They also had same religions, same structure of governments and same literature since they shared most philosophers.