The major construction project built during the rule of Emperor Qin Shi Huang in China was the Great Wall of China. Initiated in the 3rd century BCE, the Great Wall was constructed to protect the newly unified Chinese states from invasions by nomadic tribes from the north. Qin Shi Huang, the first emperor of China, aimed to consolidate his power and secure his empire. While earlier walls had been built by various states, Qin's efforts to connect and expand these fortifications into a unified defense system marked a critical moment in Chinese history. The Great Wall stands today as a symbol of China's strength and perseverance over centuries.