Why are dynasties with Nanjing as their capital often short-lived?
The reason for 1 is that those countries that set their capital in Nanjing basically chose to build their capital in Nanjing under the situation of confrontation between the north and the south. At that time, a separatist regime was established in the south, but these forces in the south were never stronger than those in the north. We should know that the forces of these regimes who settled in the Central Plains are often very powerful, so it is impossible for these southern regimes to win the war when they compete with the forces of the Central Plains.
The second reason is that Nanjing's geographical position is not dominant. At that time, many feng shui masters said that the feng shui in Nanjing was not good, and it was somewhat superstitious. However, the terrain of Nanjing does not occupy too many advantages. If we compare the geographical locations of Nanjing and Luoyang in Chang 'an, we will find that Nanjing did not have many advantages at that time. Because as long as the northern regime attacks the southern regime, it will soon capture Nanjing, leading to the demise of the whole country. Nanjing's defensive ability is very weak and it is easy to be captured by the northern regime. Nanjing's defensive ability is inferior to other cities.
The third reason is that the scenery in Nanjing was beautiful at that time. People have lived in Jiangnan for a long time, and it is easy to kill some people's will. Most dynasties in Nanjing, with its capital, lived a relatively quiet life. In addition, the scenery in the south of the Yangtze River is very beautiful, and it is easy to make people depressed in this beautiful scenery. Because people lived a very rich life in Nanjing at that time, many literati came to Nanjing to express their ambitions, but because life was too stable, people gradually forgot some factors that they wanted to struggle at that time.