character: Zhang Qian
topic: Exploration and diplomacy with the Xiongnu
grade: 4
subject: Social Studies
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character: Xiongnu
topic: Nomadic tribe interaction with Han China
grade: 4
subject: Social Studies
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character: Emperor Wu
topic: Support for Zhang Qian's missions
grade: 4
subject: Social Studies
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character: Silk Road
topic: Trade routes established after Zhang Qian's explorations
grade: 4
subject: Social Studies
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