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Tribes in Huang He Valley begin working together
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Huang He Valley becomes the centre of Chinese culture, society and learning
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Da Yu, first leader of the Xia Dynasty, created systems to control the floods in the Huang He Valley
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The path of the river shifted east
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Warring States Period; it was common to attack dikes, canals and reservoirs to disrupt water access and to cause flooding of enemy territory
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The Huang He River flooded vast amounts of surrounding lands
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Major flooding caused the river to shift north, to where it exists today