The Xia Dynasty was founded around 2000 BC. Until the Qin Dynasty unified China and established centralization of authority; Then to the super-strong development of material, culture and military in Han Dynasty; At the peak of the development of feudal society in the Tang Dynasty (Chang 'an was called the largest capital at that time), the cultural influence was unprecedented and radiated to the East Asian cultural circle; Then, with the further development of economy and culture in Song Dynasty, the total economic output accounts for 60% of the world. Then the Yuan Dynasty established the first centralization of ethnic minorities, which spanned Eurasia and conquered all directions. Until the early Ming Dynasty, shipping was unprecedentedly prosperous. This ushered in the real slow development of China feudal society. Until the Opium War was opened to the world, China's economic aggregate was still the first in the world; Until the Revolution of 1911 of 19 1 1 ended the feudal system of China for more than two thousand years, China established a democratic system; 1949, when People's Republic of China (PRC) was founded, the people of China really stood up for the first time, and China began to enter a new era.