character: Emperor Qin Shi Huang
topic: Great Wall Builder
grade: 4
subject: Social Studies
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character: Ancient Chinese Soldiers
topic: Importance of the Wall for Defense
grade: 4
subject: Social Studies
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character: Mongolian Tribes
topic: Threats that the Wall Defended Against
grade: 4
subject: Social Studies
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character: Architects of the Great Wall
topic: Construction Techniques of the Wall
grade: 4
subject: Social Studies
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