Answer:
Great Wall of China
Explanation:
The Great Wall of China built during the reign of Qin Shi Huangdi. During the Qin dynasty, people begin constructing the wall around China. Emperor Qin believed that China needed more dependable shield to stop invading and disturbance in the north region. The wall was successful in keeping away invaders from the North, especially the Mongols from the North who frequently attacked China and with their skills in warfare.
