What was the main political system of the ancient Greek city-states?

The political system of ancient Greek city-states was dominated by residents.

The meaning of the political system of the ancient Greek city-state: the forms of political organization and governance of many small slave countries with cities as the center in Greece from the 8th century BC to the 4th century BC. A city-state is generally composed of a city and several nearby villages, with an area of only a hundred miles, a population of only tens of thousands, and a maximum of only a few hundred thousand. City-states usually maintain political and military ties in the form of alliances, but they are independent in principle.

Level of city-state residents:

Citizens who have civil rights and can participate in political activities.

A free man without citizenship.

The vast number of slaves have no political rights and personal freedom.