Jiangsu Province during the Qin and Han Dynasties to the Southern and Northern Dynasties

After Emperor Qin Shi Huang unified China, the system of prefectures and counties was implemented. During the Qin Dynasty, the northern part of jiangsu Province was divided into Sishui County, Donghai County, and Langye County, while the southern part of jiangsu Province was divided into Fu County and Kuaiji County. After Liu Bang established the Western Han Dynasty, he implemented the parallel operation of prefectures and states, and jiangsu was divided into Yangzhou, Xuzhou Governor's Department, and Wu Chu and other vassal states. During the reigns of Emperor Hui, Emperor Wen, and Emperor Jing of the Western Han Dynasty, it was the first peak of economic development between the Jianghuai region and the southern jiangsu area. During the Three Kingdoms period, the area north of Jianghuai belonged to the Cao Wei regime, while the area south of the Yangtze River belonged to the Sun Wu regime. At the beginning of the Western Jin Dynasty, the counties south of the Yangtze River in present-day jiangsu belonged to Danyang, Jinling, Wu Commandery, and other counties in Yangzhou, while the counties north of the Yangtze River mainly belonged to Pengcheng, Xiapi, Donghai, Linhuai, Guangling, and other counties in Xuzhou. During the Eastern Jin and Southern Dynasties, the administrative divisions in the Jiangnan region were complex, and the Jianghuai area was a middle area contested by both the north and south. In the Chen Dynasty, the northern part of the Yangtze River was basically under the jurisdiction of the Northern Qi and Northern Zhou. The Wei, Jin, Southern and Northern Dynasties were a turning point in the development of local culture. During this period, there were frequent wars in the Central Plains, and a large number of Han residents migrated south, which not only promoted the cultural development of Jiangnan, but also brought about the gradual southward movement of China's political, economic, and cultural centers