How did this tradition come about? Because Ann used to be the birthplace of Zhou people. Although Zhou people also admitted that Henan was the center, it still tended to be the birthplace of the West. Then the invincible state of Qin also originated in the west, which means that the birthplace of the Qin Dynasty is also near Xi 'an. Perhaps it was because the Qin Dynasty was so powerful that it left a deep impression on people. This brought influence to later dynasties. In other words, Xi 'an is the land of kings and has the spirit of kings. The ancients believed in Feng Shui, so they believed in Feng Shui.
Sometimes when the national strength is weak, it can't effectively resist the nomadic people around it. At this time, it is more dangerous to choose to build a metropolis in Xi 'an. But there are still many people who are not afraid to die and build their capital in Xi 'an, and some even die because they don't move the capital anyway. However, when the national strength is relatively strong, it is better to build the capital in Xi 'an, and the nomadic people around it can't threaten the safety of the capital. Food from the south can also reach Beijing very quickly, so it won't affect it at all.
As for why they don't choose to build their capital in the south? The reason is that although the north is dangerous, it is also easy to produce good soldiers. First of all, the north is the political center for many years, with a high level of culture and everything, and the aristocratic families in this place will also be highly educated. Then the folk customs in the north are more fierce. If you choose to build the capital in the south, it is equivalent to giving up the whole north.
If ordinary people are allowed to manage the north, the emperor will not be particularly worried, because it is too dangerous, because it is not in the political center, and if there are people with poor supervision, some people recruit in the secluded land, which is difficult to suppress, so the north has always been a battleground for military strategists. Only by building everything here can the emperor rest assured.