Over the course of China`s history. there have been several periods honored as times of peace and prosperity. such as Wenjing Era of the Western Han Dynasty. Zhenguan Era of the Tang. Yongxuan Era of the Ming and Kangyongqian of the Qing Dynasty. Besides these four. there is also a Warring States Time of Peace and Prosperity that is not commonly known.

All the five times of peace and prosperity mentioned above were in the wake of wars and chaos.The Western Han was established on the ruins of the Qin Dynasty. After 170 years of ``rehabilitation``. it reached its prime. Zhenguan Era came out after the chaos at the end of the Sui Dynasty. The Ming Dynasty. after driving out the Mongol rulers of the Yuan Dynasty brought about the Yongxuan Times. Since the middle of the reign of Shenzong Emperor in the Ming. the state gradually fell into chaos. which lasted nearly half a century until the Qing Dynasty was established. The Manchu rulers took another 20 years to conquer all the rebels around the country and China entered another time of peace and prosperity. The period of Warring States was unique. It seems that the seven states were in disorder and chaos. but actually each of them had kept the stability for a relatively long period. Finally. the Qin Dynasty conquered all of them and reached its prime.

These times of peace and prosperity share common features: a unified state. a prosperous economy. a stable political environment. a powerful country and a diversified and developed culture.

During the Spring and Autumn Period. the old system was broken and a new one was taking shape. In the Warring States Period. with reforms being carried out. the states of Qin. Han. Qi. Zhao and Yan were getting more and more powerful. Among them. the reform in the Qin State was more complete and effective. In spite of this. every one of them had replaced serfdom with feudalism.

The Qin Dynasty started the monarchy in China. Since then. the unity of the state has become an important principle to assess the achievement of a dynasty. which also serves as an important prerequisite to judge the times of peace and prosperity. The reigns of Wendi. Jingdi and Wudi emperors of the Western Han Dynasty. was the period of expansion. The war against the Huns in the north lasted half a century when the Han army finally drove away the Huns. The Hexi Corridor previously occupied by the Hun was included in the map of the Han. and the areas to the west of Yumen Pass were feudatory to the Han's court. In the east. part of eastern Liaoning was included in its domain. Such expansions continued in the south. southwest and southeast. During the reign of Wudi Emperor. a unified country that was larger than the Qin had been established.
The prime of the Tang Dynasty brought another expansion. The domain of the Tang was even larger than that of the Western Han.

An unprecedented unification had been fulfilled in the Han and Tang dynasties. which were two important historical periods for the domain expansion of China.

During the reigns of Yongle and Xuande emperors of the Ming Dynasty. the country solidified its national security in the north. south and southwest. as well as the northeast. Many neighboring countries became feudatories of the Ming court. After that. the domain of the country was reduced a little bit. Talking about the vastness of the domain. no other time. except the Yuan Dynasty. could be compared with Kangyongqian of the Qing Dynasty. Moreover. it was since the reign of Kangxi Emperor that the Chinese rulers began to stop the construction of the Great Wall. which set a good foundation for the formation of a modern multi-ethnic China.