Please answer the history question and help.

Under the rule of Yu Wentai, the Northern Wei Dynasty basically carried out the policy of localization of Hu people, and made efforts to make Xianbei people a member of the Han nationality, which can be said to be the most moderate ethnic group in the northern minority regime. The Tang Dynasty implemented a real policy of ethnic integration and accepted them with an open mind, while the Yuan Dynasty implemented a policy of ethnic classification, which divided the ethnic groups in the Central Plains into four classes: Mongolian, Semu, Tibetan and Han. He tried to kill all the people surnamed Zhao, and later killed all the top names, which directly led to the resistance of the Han people. Therefore, the rule of Mongolia ended in less than 90 years, and the resistance never stopped in these decades. The policy of the early Qing Dynasty was similar to that of the Yuan Dynasty, forcing the Han people to accept their behaviors, such as shaving their heads, "leaving their hair without hair", and its ferocity can be imagined. The cruelty of "three butchers in Jiading and ten days in Yangzhou" can also be seen. There is also a saying that the Sichuan Massacre was actually committed by a lot of people in the Qing Dynasty, not by Zhang Qian, and it killed more than 7 million people in Sichuan.