What are the course and characteristics of the development of ancient western Asian cities and polis?

City-state, or city-state, is a kind of citizen collective that evolved from primitive commune under certain historical conditions. The remarkable characteristics of ancient Greek history from the 8th century BC to the 4th century BC are the unbalanced development of economy, politics and culture in various regions, the coexistence of hundreds of city-states, and the emergence of many city-state alliances. Generally speaking, a city-state includes two parts: the city and the countryside. The city mentioned here refers to a political and religious center that is easy to keep and often has walls. A large number of polis were established by immigrants sent by the original polis.