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Human history - Wikipedia[43][44] followed by Egyptian civilization along the Nile River (3000 BCE),[9][45] the Harappan civilization in the Indus River Valley (in present-day India and Pakistan; 2500 BCE),[46][47] and <span>Chinese civilization along the Yellow and Yangtze Rivers (2200 BCE).[10][11] These societies developed a number of unifying characteristics, including a central government, a complex economy and social structure, sophisticated language and writing system Summary
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