At that time, in order to defend each other against the invasion of the enemy, the princes on one side built walls on their own territory, all of which were hundreds of miles long. The first vassal state to build walls was Chu, and later all the vassals began to imitate. However, Xiongnu and nomadic people in different countries often interfered, resulting in property and human life suffering, so they built a large-scale wall, which just became the foundation of the Great Wall.<br>
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