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Human history - Wikipediawere concentrated in fertile river valleys: the Tigris and Euphrates in Mesopotamia, the Nile in Egypt,[59] the Indus in the Indian subcontinent,[46] and the Yangtze and Yellow Rivers in China. <span>Sumer, located in Mesopotamia, is the first known complex civilization, having developed the first city-states in the 4th millennium BCE.[43] It was in these cities that the earliest known form of writing, cuneiform script, appeared around 3000 BCE.[60][61 Summary
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