Some 6.000 years ago, some Neolithic villages became cities as a result of agricultural and commercial prosperity. These civilizations invented writting.  

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The first great civilizations developed along large rivers surrounded by fertile land: 

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• Mesopotamia: River Tigris and Euphrates

• India: Indus River

• China: Huang He and Yangtze Rivers

• Egypt: Nile River

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The Mesopotamian civilization appeared in the Fertile Crescent, in the fertile plains between River Tigris and River Euphrates

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