How did Shi Huangdi attempt to defend the Qin Empire from attacks by nomads? O Built the Silk Road
O Completed a 2,500 mile wall
O Wrote Hammurabi's Code
O Ended legalism in the government

Completed a 2,500 mile wall

Explanation:

To defend the Qin Empire, Shi Huangdi built a 2500 mile long wall that is today known as the Great Wall of China.

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answer; /// i believe that the correct answer is (d)the huang he river valley;