Have you studied history, have you found a special phenomenon?
The regimes established by the Han people, whether they were Qin, Han, or Sui and Tang, including the Ming Dynasty. Their territory is within the Great Wall.
So why have the Han Chinese established political power all along the Great Wall?
Although the Han had defeated the nomadic people countless times, such as Wei Qing and Huo Quai in the Han Dynasty, huo went to the disease and hit Lake Baikal, why did he not occupy this place and turn it into a place ruled by the Han People?
The real core reason you can't imagine at all, it's related to rainfall.
First of all, the Great Wall was not built by Qin Shi Huang alone, the Great Wall was built before Qin Shi Huang, by the small countries in the north, such as the Yan State and the Zhao State have their own Great Wall, the Qin State also has its own Great Wall, Qin Shi Huang just connected these Great Walls together.
However, the most amazing thing is not here, the most amazing is that the line built by the Great Wall is exactly the same as the 15-inch rain line, almost completely overlapping.
So what is the 15-inch isopido line?
The 15-inch isopied rain line is the position where the annual rainfall is 380-400 mm is called the 15-inch isopied rain line.
Above the waiting rain line, it is the area dominated by ethnic minority nomads.
Below the rain line is the area ruled by the agrarian civilization.
In addition, if the rainfall is less than 100 mm, it will become desertification and desertification; if the rainfall is between 100 mm and 250 mm, it will only grow grass and cannot cultivate land.
So even if Hogo went to Lake Baikal with illness, he couldn't rule here.
Therefore, the ruling area of the Central Plains civilization has always been within the Great Wall,
It was decided by the rain!
Original video: Why the Han people can not do without the Great Wall