Let's talk about the gradual reunification of the country. During the Eastern Jin Dynasty, the five lakes in the north established a sixteen-nation confrontation, which led the northerners to move south. Later, the Northern Wei Dynasty unified the North, and later the Southern Dynasty gradually merged into the Sui Dynasty. From this process, the country gradually unified.
Social and economic development resumed, the three countries and sixteen countries in the Eastern Jin Dynasty hit the north hard, and the northern dynasties gradually developed, especially the reform of Emperor Xiaowen in the northern Wei Dynasty, the development of Chang 'an and Luoyang in the Sui and Tang Dynasties, and the northern economy gradually recovered. Needless to say, the war in the north led northerners to move south with advanced production technology and tools, and the labor force promoted the economic development in the south. China's economic center of gravity began to move south, so the southern economy developed unprecedentedly. During the Southern Dynasties, Jiankang was a developed city with a population of over one million.
Technology and culture are changing with each passing day. Many of Wang Xizhi's writings, Gu Kaizhi's paintings, Li Daoyuan's Notes on Water Classics, Zu Chongzhi's Pi, the sculptures of Longmen Grottoes and Yungang Grottoes, and Jia Sixie's Qi Yao Min Shu all show that the science and technology culture of Wei, Jin, Southern and Northern Dynasties has developed and made remarkable achievements.