What changes have taken place from the Western Han Dynasty to the Southern Dynasties by region?

Analyze and compare the above two materials to explain how the Jiangnan area changed from the Western Han Dynasty to the Southern Dynasties.

It shows that Jiangnan has become densely populated, rich in products and rich in people's lives from being sparsely populated and self-sufficient.

2. Why did this change happen?

During the Eastern Jin Dynasty, there were three great migrations in the Central Plains of China, mainly from Shanxi, Hebei, Henan and other central plains to Jiangsu and Zhejiang, which was the reason for the population gathering and growth in the south of the Yangtze River. In addition to population growth, immigrants have also brought advanced production technology to the Central Plains.

3. How far-reaching impact has this change had on China's economy?

Because the Central Plains has been invaded by nomadic people in the north for a long time, Jiangsu and Zhejiang provinces have become important tax sources and grain producing areas in China after crossing the south. At the same time, economic development has further promoted population growth, resulting in uneven population distribution in China today.

These problems are generally not difficult as long as they are based on historical facts and combined with reality. Anyone who studies history will know Nandu, right? I study Chinese.