First of all, politically, China was the first country to enter the feudal society, nearly 1000 years earlier than the western countries. It was also the first country to establish centralization and invent the imperial examination system, thus increasing the methods for lower-level talents to participate in politics, and the management system of the county system. Economically, before the Opium War in Britain, China's gross national product was always in the leading position in the world. In the Sui Dynasty, China ranked first in the world in geography, economy, military and population, which can be said to have reached an unprecedented level. Even in the Tang Dynasty, the population and economic strength in the early Sui Dynasty were not surpassed. The Northern Song Dynasty was the most glorious period of China's economic development. The gross national product accounts for 80% of the world, which is equivalent to the current strength of 2.5 United States. It can be said that China was the richest in the Song Dynasty. The purchasing power of copper is 3-4 times that of Qing Dynasty. During the Daoguang period, the population of the Qing Dynasty reached the peak of nearly 400 million. Militarily, China's ancient military thought has always been ahead of the world. China was also the first country to enter the Iron Age, the earliest four inventions of military theory, Sun Tzu's Art of War and gunpowder.