What's the difference between Jiangnan today and ancient times?

Generally speaking, it refers to the areas south of the Yangtze River, such as southern Jiangsu, northern Zhejiang and today's Shanghai. The definition of Jiangnan has been changing since ancient times. ? Jiangnan? This word has been used since the Qin and Han Dynasties. There is also a kind of Jiangnan in Qian Ke Sao's poems. Generally speaking, Yangzhou, Nanjing and other beautiful women come forth in large numbers, which makes talented people and beautiful women unforgettable. The famous Emperor Qianlong of Qing Dynasty flourished in Jiangnan, which means Jiangnan in this sense. Today, Jiangnan in our general economic sense includes Jiangsu, Zhejiang and Shanghai and some economically advantageous areas around them, which is different from the definition of Jiangnan in history. Generally speaking, it is an area extending with the Yangtze River as the central axis.