What are the major contributions of the Qin dynasty to China?

          The Qin dynasty was one of the greatest empires in Chinese history. In around 300 BC, seven different states in China fought each other. The Qin state emerged as the most powerful of the warring states. King Zhen of the Qin state defeated the other six states. King Zhen took the name of Qin Shih Huang Di, and became the first emperor of China.

          As a part of its centralization, the Qin connected the northern border walls of the states it defeated, making the first Great Wall of China. 

                 During its rule, the dynasty built a powerful army, and increased trade across China. The contributions of the Qin dynasty also include the unification of the legal code. They laid down standards for writing, money, weights and measures. Civil servants were appointed by the Emperor to handle daily governance. The changes made by Qin dynasty helped the later dynasties like Han, to rule effectively.