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If a king ruled unfairly he could lose this approval, which would result in his downfall. Overthrow, natural disasters, and famine were taken as a sign that the ruler had lost the Mandate of Heaven. ... The Mandate of Heaven did not require a ruler to be of noble birth, and had no time limitations.
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Direct democracy or pure democracy is a form of democracy in which people decide on policy initiatives directly. This differs from the majority of currently established democracies, which are representative democracies. (Google definition)
It would be "Europe" that harbored the agriculture revolution by 5000 B.C, since Europe's many rivers and location led to rich soil due to irrigation, which was essential for farming and crop growth.