The demise of the Qin Dynasty has nothing to do with the geomantic omen of Qin Shihuang's mausoleum. Moreover, the collapse of every dynasty was not due to geomantic omen. Their downfall was closely related to the rulers of the dynasty.
In my opinion, there are two important reasons for the demise of the Qin Dynasty in a very short time:
First of all, taxes in the Qin Dynasty were very heavy. After Qin Shihuang's reunification, he did not give the Qin people generous and kind treatment, but increased the taxes on corvees, making the people still live in dire straits.
In order to build the Great Wall and his mausoleum, Qin Shihuang spent a lot of manpower and material resources. What's more, he constantly recruited people from all over the country and made his own contribution to his vast project.
These huge projects are not completely useless. The Great Wall he built had a strategic vision, which not only avoided the invasion of Xiongnu, but also conveyed the news to the people in Shanhaiguan in time.
Second, the system of the Qin Dynasty was cruel. During the Qin dynasty, in addition to increasing the corvee tax, the criminal law was also very strict. Many people are afraid of punishment and live cautiously.
Remember Guangwu and Bobby Chen who rose in osawa Township? Because of the heavy rain, they delayed their trip, thinking of their fate of being killed in the end, they chose to get up and resist their fate.
It was under such circumstances that more and more rebels appeared on the land of the Qin Dynasty, and they cooperated with Qi Xin to resist the tyranny of the Qin Dynasty.
Say? The wall fell and everyone pushed? Finally, with the concerted efforts of Qi Xin, the Qin Dynasty was quickly submerged in history by a powerful dynasty.