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The Great Wall was built to protect China from invasions from "summary" of The Story of China by Michael Wood

The Great Wall of China, one of the most famous structures in the world, stretches for thousands of miles across the northern frontier of China. This monumental construction was not simply a barrier to keep people out; rather, it was a complex system of fortifications designed to protect the Chinese empire from invasions by various nomadic groups from the north. The idea of building a defensive wall to keep out potential invaders was not new in China. In fact, walls had been built in various parts of the country for centuries before the construction of the Great Wall began. However, it was during the reign of the first emperor of China, Qin Shi Huang, that the idea of connecting these individual walls into one continuous barrier took shape. The construction of the Great Wall was a massive undertaking that involved the labor of millions of workers over several centuries. It was built using a combination of stone, brick, tamped earth, wood, and other materials, depend...
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    The Story of China

    Michael Wood

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