Where was the world's first city-state?

The first city-states were in Sumer, but they reached their peak in Greece.

Explanation: The first city-states were in Sumer, but they reached their peak in Greece. From the beginning of Greek history to its climax in the 5th and 4th cent. BC, the Greeks were organized into city-states, of which there were several hundred. The first Italian city-states were Greek colonies.

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