character: Wang Jun
topic: The significance of the Great Wall in Chinese history
grade: 4
subject: Social Studies
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character: Emperor Qin
topic: Building of the Great Wall
grade: 4
subject: Social Studies
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character: Mongol Invaders
topic: Great Wall as a defense against invasions
grade: 4
subject: Social Studies
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character: Chinese Farmers
topic: Impact of the Great Wall on agriculture and trade
grade: 4
subject: Social Studies
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