Perhaps the most obvious evidence of China's relationship with outsiders is the:

Name: Perhaps the most obvious evidence of China's relationship with outsiders is the:
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The Great Wall is perhaps the most iconic symbol of China's relationship with outsiders, as it was built in part to protect against invasion from various nomadic groups to the north. Its construction began as early as the 7th century BCE and continued through various dynasties up until the Ming dynasty in the 17th century CE.

Perhaps the Most Obvious Evidence of China's Relationship with Outsiders