character: Zheng He
topic: Impact of Zheng He's Voyages on Trade
grade: 4
subject: Social Studies
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character: Marco Polo
topic: Influence of Trade Routes in the East
grade: 4
subject: Social Studies
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character: Christopher Columbus
topic: Exploration and Trade in the New World
grade: 4
subject: Social Studies
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character: Vasco da Gama
topic: Sea Routes to India and Its Effects on Trade
grade: 4
subject: Social Studies
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