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The emperor was Yangdi, It connected between Bejing and Hangzhou. It made transportation easier.
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Wood writing helped keep track of events and words.
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This helped Japan keep order straight.
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This helped with trade and the economy.
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This helped the navy and sailors navigate.
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This affected them because it killed a whole lot of them in that time.
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This made the Chinese be on their heels and have better defenses.
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This affected them because they were not one country.
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This made them a unified country again.
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They lost money making them weak.
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They stared to take money from smaller countries.
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This affected their trading.