How did Shi Huangdi use fear to make sure there was no opposition to his rule AND avoid revolts in the cities he conquered when expanding his empire?

The leader of the victorious Qin state established the Qin Dynasty and recast himself as Shi Huangdi, the First Emperor of China.

The Qin Dynasty was one of the shortest in all of Chinese history, lasting only about 15 years, but was also one of the most important. It was marked by a strong sense of unification and crucial technological and cultural innovation.

Shi Huangdi standardized writing throughout the empire, built expansive infrastructure, such as highways and canals, standardized currency and measurement, conducted a census, and established a postal system.

Legalism was the official philosophy, and other philosophies, such as Confucianism, were suppressed. Shi Huangdi also built the Great Wall of China, roughly 1,500 miles long and guarded by a massive army, to protect the nation against northern invaders.

The Qin Dynasty collapsed after only 15 years. There was a brief period of chaos until the Han Dynasty was established.  

Mandate of Heaven: The belief, dating from ancient China, that heaven gives a ruler the right to rule fairly.

Legalism: A Chinese philosophy claiming that a strong state is necessary to curtail human self-interest.

Great Wall of China: An ancient Chinese fortification, almost 4,000 miles long, originally designed to protect China from the Mongols. Construction began during the Qin Dynasty, under Shi Huangdi.

Explanation:

II dont know if its right.

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explanation:

not all were fit for battle and were weak.