character: Emperor Zhu Di
topic: Support of Maritime Trade in China
grade: 4
subject: Social Studies
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character: Emperor Yongle
topic: Zhu Di's Reign and Maritime Expansion
grade: 4
subject: Social Studies
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character: Zheng He
topic: Voyages and Trade Missions
grade: 4
subject: Social Studies
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character: Ming Dynasty
topic: Impact on Trade and Exploration
grade: 4
subject: Social Studies
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