Final answer:
Shi Huangdi's greatest achievement was the construction of the Great Wall.
Step-by-step explanation:
One of Shi Huangdi's greatest achievements was the construction of the Great Wall, which served as a defensive barrier against invasions. The Great Wall is a remarkable feat of engineering and stretches over thousands of miles in northern China. It not only protected the empire but also symbolized the power and authority of the Qin Dynasty.
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