Nanjing, Beijing, Xi'an, Luoyang
The main sites for ancient imperial cities were (1) geographically stable (no earthquake hazards or river flooding hazards) (2) fertile land, Sufficient water resources and convenient transportation (3) Military strategic locations and the so-called Feng Shui pattern are nothing less than this
But now the general environment has changed,
Beijing: The capital was built because of the Sino-Soviet Union at the beginning of the founding of the People's Republic of China The relationship is determined by Japan’s geographical location. Because it is the capital, of course it must focus on development.
Nanjing: It’s because China needs to have an entry point to communicate with the world and reform and open up, and maritime transportation is developed. Of course development is also needed.
Xi'an: Actually not much better than Luoyang, but as a tourist and cultural attraction, it is located in Shaanxi's national poverty alleviation area and an old revolutionary base area, so it must be properly taken care of.
Luoyang: Located in Henan, there is no shipping and no minerals. As the center of China, the central government is not afraid of you making trouble. The population base is so large that even if the state invests, it will be slow to bear fruit. So as a leader you don’t focus on developing it.