It was also a usurpation of the throne. Why was Cao Wei's replacement of Han recognized by later generations, but Sima's replacement of Wei was criticized?

Personally, I think the most fundamental reason is that the Sima family replaced the Cao family when they seized the country. The process was too bloody. The change of dynasties in ancient times was actually an act of violence. However, you cannot make the violence too obvious, in other words, you can only replace bloody violence with cold violence and bloodless violence. At the same time, it is necessary to give a reasonable explanation for the change of throne so that others can convince you. ?

Obviously, Cao Wei replaced Han Dynasty with bloodless violence, and there is a reasonable explanation. The replacement of the Cao family by the Sima family was not only bloody and violent, but also inexplicable. ?

Cao Wei replaced the Han Dynasty because the Han Dynasty had fallen apart. The entire northern region was unified under the leadership of Cao Cao. Cao Cao was very kind to Emperor Xian of Han from beginning to end. Although he controlled the court and did not give Emperor Xian of Han any power, in fact, because Emperor Xian of Han himself was incompetent, and only Cao Cao could preside over some government work, he could make a difference in troubled times. Cao Cao was not hypocritical.

Emperor Xian of the Han Dynasty "abdicated" the throne to Cao Pi? In addition, the "abdication" scene was also performed very realistically, and the kung fu was also well done. In the past, Emperor Xian of the Han Dynasty expressed his intention to give up the throne many times, but Cao Pi refused many times. Later, when it became impossible to turn it down, Cao Pi "reluctantly" agreed from the perspective of national development. ?

The Sima family used "bloody violence". From Sima Yi killing Cao Shuang to Sima Yan seizing the throne, it can be said that countless people were killed, including court ministers, the Cao Wei clan, and even an emperor and two others. The emperor was also publicly deposed, something that would never have been recognized by the world in any dynasty or at any time.