From the perspective of economics, this book selects several aspects to try to reveal the secrets of war and peace between the grasslands and the Central Plains. For example, did the Great Wall really play a big role in the collision and integration of the Central Plains dynasties and the grassland peoples? Why was the Song Dynasty willing to sign the famous "Chanyuan Alliance" with the Liao Kingdom when it was not defeated? Why was Emperor Taizong of the Tang Dynasty able to become the "Khan" of the grassland people? What is the economic explanation for the murderousness of the Mongolian legions led by Genghis Khan? Why did the Ming Dynasty continue to fight with the northern grassland peoples for more than 200 years?
