character: Ming Dynasty
topic: The Great Wall's Role in Defense
grade: 4
subject: Social Studies
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character: Emperor Yongle
topic: Strengthening the Great Wall
grade: 4
subject: Social Studies
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character: Soldiers
topic: Protection Offered by the Great Wall
grade: 4
subject: Social Studies
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character: Merchants
topic: Trade and Defense along the Great Wall
grade: 4
subject: Social Studies
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