Ancient Mesopotamia - The Sumerians
This is why Mesopotamia is part of the fertile crescent, an area of land in the Middle East that is rich in fertile soil and crescent-shaped. The Sumerians were the first people to migrate to Mesopotamia, they created a great civilization. Beginning around 5,500 years ago, the Sumerians built cities along the rivers in Lower Mesopotamia, specialized, cooperated, and made many advances in technology.
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