Economy: South China development.

Nation: Great national integration.

Culture: the great development of Buddhism. Religion prevails and Confucianism is in crisis.

1, split period

The feudal society in China is divided into three periods: the Spring and Autumn Period, the Warring States Period, the Three Kingdoms, the Jin Dynasty, the Southern and Northern Dynasties, the Five Dynasties, the Ten Kingdoms, Liao, Song, Xia and Jin Dynasties.

Among them, the longest period of division was the Five Dynasties and Ten Kingdoms, Liao, Song, Xia and Jin Dynasties, which lasted more than 300 years, and the shortest period was the Three Kingdoms period.

2. The period of unification

China feudal society has four unified periods, namely Qin and Han Dynasties, Sui and Tang Dynasties, Western Jin Dynasty, Yuan Dynasty, Ming Dynasty and Qing Dynasty.

Although the Western Jin Dynasty established a national unified political power, it soon perished.

Among them, the longest period of reunification was the Tang Dynasty.

Reasons for reunification:

(1) The establishment and development of centralization has played a role in consolidating a multi-ethnic country.

(2) "China's unique and relatively independent natural geographical conditions.

(3) Cultural tradition: In the ancient culture of China, a unified thought appeared very early, which was inherited and developed by Confucianism and became the ideological source of the Chinese nation with strong cohesion.