Genghis Khan's vision of a united political empire was never truly achieved becauseA. his son Ögedei died before completing the conquest of Vienna.B. civil wars emerged among his descendants, thus breaking the empire up along the lines created by the four patrimonial states.C. Kublai Khan and his successors, as great Khans, attempted to rule the empire from Beijing.D. he had failed to conquer all of China, which then occupied eastern Mongolia and incorporated into the Yuan Dynasty.

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