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The Great Wall of China is built to keep the enemies away and for protection.
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 the Great Wall of China was built it is because it is their protection from enemies Great Wall of China was build by Shin Huang Di over 20years before finish it. And it is located at China obviously and how many mountains did Shin Huang Di include so that his companion will be safe and how many century but still The Great Wall of China was still the same like before.