Which factor prevented the Mesopotamian city-states from uniting before 2400 BCE?

Which factor prevented the Mesopotamian city-states from uniting before 2400 BCE?

No ruler was powerful enough to take over the other city-states.

The city-states rarely interacted due to the distance between them.

The city-states were very diverse in their religious beliefs and practices.

The languages spoken in Mesopotamia differed greatly among the city-states.

No ruler was powerful enough to take over the other city-states.

Explanation:

Mesopotamian city-states did not unite with each other in 2400 BCE because they did not have a powerful ruler that could bring them all together.

However, with the arrival of the powerful King Sargon the Great, these previously warring city-states were brought together and formed a formidable empire called the Akkadian Empire.

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