Why is Sichuan always vast and sparsely populated in history, and Hubei, Guangzhou and Sichuan have failed to expand?

There were many famous immigrants in Qing dynasty, such as going to the west and the east.

Among them, the famous case of southern immigrants is that Huguang filled Sichuan, which flourished from Kangxi to Qianlong and lasted for a hundred years. Chengdu Prison is equivalent to an encyclopedia of Chengdu in the late Qing Dynasty. The author of this book collected many contents of Chengdu at that time according to his own personal experience.

Astronomical geography, three religions and nine streams, can be said to have everything. In this book, we know that in the late Qing Dynasty, most people in Chengdu came from other provinces, with few locals. In fact, a large part of them come from Huguang and other places, and the reason why the population of Chengdu has not been growing is inseparable from their geographical location.

Because of its dangerous terrain, Sichuan was the first choice when many small regimes were established. And as a frontier place, they will be invaded by many foreign troops. The most famous event is the Song and Jin events. The Mongols attacked Song and Jin by bypassing Sichuan, killing all the people in Sichuan and outside Sichuan. Later, when the Ming and Qing Dynasties were in war, it was a gathering place for many regimes.

Legend has it that Zhang slaughtered Sichuan and Shu, and some people say that the Qing Dynasty put down the war. There have been three slaughterhouses. Apart from the problems left over from history, tigers are prevalent in Sichuan, and there are many cases of cannibalism. However, judging from the current population, Sichuan has become a populous province, and the growth during this period is naturally inseparable from the support of China's construction.