Why is Beijing the capital of China?

Beijing is surrounded by mountains on three sides, surrounded by mountains. It's very good from the perspective of geomantic omen, which happens to be the throat position from northeast to north China. Convenient transportation and four distinct seasons. The disadvantage is that there are few water sources and it is close to the national border.

Xi 'an is located inland, farthest from the national border, but the traffic is the most inconvenient, with little water and dryness.

Nanjing has close water sources and convenient transportation. But the first one to be eliminated was Nanjing. Because from ancient China, any country with its capital in the north must have unified the whole country. This is true in Qin, Han, Jin, Tang, Yuan, Ming and Qing dynasties. The Three Kingdoms, Five Dynasties and Ten Kingdoms, Song Jindu was a period of relative balance of power, and there was no question of unification. Moreover, when People's Republic of China (PRC) was founded, enemy planes bombed Shanghai. How far is Nanjing? Nanjing, the capital of Nanjing, is seeking death. Besides, there were hundreds of thousands of Kuomintang troops at that time. In case of landing, there is no danger of defending near Nanjing. They either died on the front line or had to retreat. But have you thought about where to withdraw? When the Japanese army came from Shanghai, the national army retreated all the way to Sichuan, and Jiangsu and Hubei were all lost.

Beijing was chosen, probably because the Yuan, Ming and Qing Dynasties all established their capitals in Beijing, forming an atmosphere. Moreover, Beijing was peacefully liberated and well preserved. One more thing, Beijing is very close to the Soviet Union, and the railway is just around the corner. If there is a problem in Beijing, it can retreat north to the northeast and west to Xi. After Beijing was breached, Cixi retreated to xi. After all, Xi 'an's defeat is still a traffic problem, and the royal gas consumption is a bit too much.