What are the main factors of economic development in Jiangnan during the Southern and Northern Dynasties?

During this period, the main factors of economic development in the south of the Yangtze River were the migration of northerners to the south, government policies and natural conditions.

1, northerners move south: this is the most important factor to promote the development of Jiangnan area. Due to frequent wars in the north, a large number of people moved to the south, which not only provided sufficient labor force for the Jiangnan area, but also brought advanced production tools and technologies. These northern immigrants reclaimed wasteland and built water conservancy projects in the south of the Yangtze River, which greatly promoted the development of local agriculture.

2. Government policies: In order to stabilize the political situation and increase fiscal revenue, the southern government in the Southern and Northern Dynasties implemented many policies that were beneficial to economic development. The Southern Dynasties government reduced the tax burden of Jiangnan, encouraged farmers to reclaim wasteland, and built many infrastructure facilities such as roads, bridges and canals, which was conducive to promoting the economic development of Jiangnan.

3. Natural conditions: Jiangnan area has humid climate and fertile land, which is suitable for agricultural development. The developed water system and criss-crossing rivers in the south of the Yangtze River are not only beneficial to local transportation, but also to agricultural irrigation and aquaculture.