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The Yellow River (Huang He) area became settled around 4000 BCE. Many tribes settled along the river, sixth longest in the world, which was distinguished by its heavy load of yellow silt and its periodic devastating floods. A major impetus for the tribes to unite into a single kingdom by around 1500 BCE was the desire to find a solution to the frequent deadly floods. The Yellow River is often called "The Cradle of Chinese Civilization".
4000 BCE