Why did Emperor Zhu Di build such large ships, and so many of them?

An educatethe yuan dynasty was responsible for which of the following: i. improving the road system ii. increasing sea trade with india and south east asia. iii. extending the canal system iv. brutal warfare and ruthless killing of people in order to take over china. a. i & iii c. iv only b. ii only d. all of the above member of the government

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The mongols were descendants of a. pastoral nomadic tribes b. tibetan tribes c. shang nobility