21 h 51 m, 27 dic 8000 año aC - Neolithic era: the new stone age, The Neolithic Revolution led to the development of more complex economic and social systmes. The diffrenet tribes were different river valleys: Nile (Ancient Egypt), Tigris Euphrates (Ancient Mesopotamia and Babilonia), Indus Gnages (Harappan and vedic civilization), Yello river (shang)
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21 h 51 m, 27 dic 8000 año aC
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