Who divided Greece into city-states?

No one person divided Greece into city-states. The division of Greece into city-states was a gradual process that took place over several centuries. It began in the 8th century BCE when the Greek population began to grow rapidly. This growth led to the emergence of new settlements, which were often located on hilltops or in defensible locations. As these settlements grew, they became increasingly independent of the larger cities that had previously controlled them. By the 6th century BCE, Greece was divided into hundreds of city-states, each of which had its own government, laws, and culture.