The objective of this article is to study the formation of ancient Greek city-states. The results of the study revealed that the Greek city-state was an ancient political form that arose in ancient European civilizations. The Greek city-state, or Polis, is a unique historical feature of civilizations that emerged in the West. Polis is linked in politics, economy, society, culture and religion, which are fused together. Although Greece has hundreds of city-states arising However The Greeks had ties that were intertwined, and there was no divide in any way. Each city-state has different sovereignty and form of government. Greek city-states are made up of many properties, each of which share these characteristics and are similar. They became extremely important features in Western civilization. The Greek city-state prospered until the Hellenistic period. When Alexander the Great conquered those Greek city-states causing the Greek city-state to collapse and be ruled by a single king