Answer:
Qin shi huang did many good things in China.
Step-by-step explanation:
Emperor Qin shi Huang did many contributions like conquering six kingdoms to unify China, terracotta soldiers, etc.
One of the greatest things he did for China was to build the Great wall of China. The Great Wall of China build during the reign of Qin Shi Huang from the Qin dynasty. The wall was successful in keeping away invaders from the North. The Mongols from the North frequently lead raids into China and were very powerful and skilled in warfare.