In 22 1 year BC, Qin Shihuang finally unified a fragmented land of China through the war of1year. At the same time, he carried out the imperial system, established weights and measures, unified writing, and implemented the county system, which made A Qin the largest and earliest feudal country in China and even the world, and unified the land, population and mountains and rivers in the Yellow River basin, the Yangtze River basin and the Pearl River basin into one country for the first time, marking a new historical development period for Chinese civilization.
15 years, after the death of Qin Shihuang's dune, a dune coup took place. Qin's new leadership lacks sufficient political wisdom and major policies for governing and rejuvenating the country. The political corruption and imbecility of the ruling center finally aroused the dissatisfaction of the peasant class. The first peasant uprising broke out in history. In less than three years, the seemingly powerful and steady Daqin Empire did not get rid of its fate after its rise, and finally fell from its peak to its historical trough. The first farmer in the history of China became emperor, and the lucky one was Liu Bang, a farmer in Pei County. After he overthrew the establishment of Qin State, he established the Han Dynasty in the capital of Qin State.
Liu Bang's Dahan dynasty was very lucky. After he became emperor, he basically took away all the officials of the Qin Dynasty. As long as those who followed Qin Shihuang were willing to stay and continue to work for the Dahan dynasty, Liu Bang asked them to stay and work in the new court. He not only left people behind, but also left all the systems promoted by the Qin Dynasty. In other words, all organizational systems, administrative systems, management systems, legal systems, etc. The state machine of the Han Dynasty followed the system of the Qin Dynasty. Although Liu Bang overthrew the Qin State, he acknowledged the advanced nature of the Qin State system. When he couldn't create a new system, he adopted the system of Qin State, which was also his wisest choice.
After the founding of the People's Republic of China, Qin Shihuang strictly implemented the county system and was deeply saddened by the system of enfeoffment of governors in the Zhou Dynasty, which led to the division of the country. Therefore, after Qin unified the six countries, there was no arbitrary enfeoffment of the king. In the struggle with Xiang Yu, Liu Bang divided many people into kings in order to quickly destroy Xiang Yu. As a result, after the founding of the People's Republic of China, the country once again faced division. If Liu Bang hadn't led the army to crush them one by one, the country would be plunged into civil war again. Later, in order to let Liu unify the world, Liu Bang sealed many wang xing and made his son, nephew and cousin king, which led to many civil strife. Through the unremitting efforts of Emperor Hui of Han Dynasty, Emperor Wen of Han Dynasty and Emperor Jing of Han Dynasty, the potential crisis of national division was eliminated and the situation of national stability and unity was always maintained.
Therefore, the whole 400-year history, from the unification of China by Qin Shihuang in 22 1 BC to the establishment of Wei by Cao Pi in 220 AD, is the most important contribution period of Qin and Han history to the process of Chinese civilization. Although there was a brief reign of Wang Mang's "Daxin" and two periods of the Western Han Dynasty and the Eastern Han Dynasty, the overall political system of these 400 years has not changed. Through the continuous development and accumulation of this period, the content and form of Chinese civilization have been preserved and carried forward in a wide range. It laid a solid foundation for the historical process and cultural evolution of China in the next 2000 years, and also had a far-reaching impact on the social composition, political form and people's life in the next 2000 years.