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History 21 Online
OpenStudy (anonymous):

Which describes an achievement of Emperor Yangdi that helped unite China? A. He built the Great Wall of China to keep out invading Mongol hordes. B. He made Marco Polo an honored guest at the imperial court in Beijing. C. He designed a plan for a series of interconnecting canals. D. He introduced terraced farming to produce more food.

OpenStudy (anonymous):

u know @crazymexican816?

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