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The 200s decade ran from January 1, 200, to December 31, 209.
The world population is estimated to be between 190 to 256 million in 200. [1] In the Roman Empire, Septimius Severus is emperor for the whole decade. After the Yellow Turban Rebellion in China, the Han dynasty weakens as warlord seize control of China, even though Emperor Xian is in power for the whole decade. Cao Cao defeats Yuan Shao at the Battle of Cangting, eventually unifying northern China. Around this time, Brahmanism morphs into Hinduism. Caracalla and Geta are set up to heirs to Septimius Severus, and they both are Augusti by the end of the decade.
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