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The great wall of China was built to keep the Mongols from invading China.It was first built in the 7th century B.C. when China was still divided into many small states. After the unification of China in 221 B.C., the first emperor of Qin Dynasty linked the walls of the three states in the north and formed the first "Wan Li Chang Cheng" (ten thousand li Great Wall, li is a Chinese length unit, 2 li = 1 km). Since then, the Great Wall was rebuilt, modified or extended throughout Chinese history for over 2,000 years. Most of the Great Wall we see today was built in the Ming Dynasty (1368-1644). In some areas, two walls built in two different dynasties can be seen running side by side. For a more detailed history of China and the Great Wall.

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7y ago

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