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