At the end of the Eastern Han Dynasty, Cao Cao gradually eliminated the separatist forces such as Lu Bu, Yuan Shao, Yuan Shu, Liu Biao and Ma Chao. In AD 2 14, Liu Xie, Emperor Xian of the Han Dynasty, conferred the title of Cao Cao as Wang Wei, added nine tin, established the State of Wei, and made Yecheng its capital. Wei has ten counties in Jizhou, and there are hundreds of officials such as the Prime Minister, Qiu and General. In April of the 21st year of Jian 'an (2 16), Emperor Xian of the Han Dynasty named Cao Cao as Wang Wei, with a city of 30,000 households. He is a vassal, he does not become a vassal, nor is he worshipped by imperial edict. He worships heaven and earth with his crown, car clothes, logo. It was on the basis of Wei State that Cao Pi forced Emperor Xian of Han to abdicate and established a new dynasty, the title of which was still Wei. Then, the question is, why did Cao Cao establish a feudal country under the Han Dynasty and call it "Wei State" instead of Korea, Zhao State and Qin State?

First of all, during the Spring and Autumn Period and the Warring States Period before the Three Kingdoms at the end of the Han Dynasty, there was a powerful vassal state Wei on the land of the Central Plains. Of course, as far as the Seven Heroes of the Warring States are concerned, Korea, Zhao, Qin and Qi are all or part of the territory of the Central Plains. In this regard, in my opinion, the territory of South Korea is mainly in today's Henan and Shanxi, not involving Hebei. Shaanxi and Shanxi are the main parts of Qin, Shanxi and Hebei are the main parts of Zhao, and the territory of Qi is mainly in today's Shandong. On this basis, for the heyday of Wei, it expanded to Shandong Province in the east, Shaanxi Province in the west, and also involved Shanxi, Hebei, Henan and other places. So this may also be one of the reasons why Cao Cao used "Wei" as the title, that is, Wei's radiation range was relatively wide in history.

Secondly, after the battle of Guandu, Cao Cao defeated Yuan Shao and seized the territory originally belonging to Yuan Shao, such as Jizhou. Because after Cao Cao captured Hebei, he took Yecheng as his base camp. During the Warring States Period, Yecheng was the capital of Wei. The range of Yecheng ruins includes the western part of Linzhang County, Hebei Province (sites such as Yebei City and Yan 'an City). ) and the northern suburb of Anyang City, Henan Province (Cao Cao Gaoling, etc. Qi Huangong began to build Yecheng, which belonged to Wei during the Warring States Period, with Yecheng as its capital. As a battleground for military strategists, Cao Cao expanded Yecheng after occupying it. After Cao Pi usurped the independence of Han Dynasty, although Cao Wei made Luoyang its capital, Wei took Luoyang as its capital and Chang 'an, Qiaocheng, Xuchang, Yecheng and Luoyang as its "five capitals", which shows the important position of Yecheng.

In addition, there is another reason. At the end of the Eastern Han Dynasty, there was an Oracle that "the generation of the Han Dynasty is the contemporary Tugao". Yuan Shu, a warlord at the end of the Han Dynasty, once quoted this prophecy, saying that his word "highway" meant tu, which proved that he should replace the only thrill of the Han Dynasty.

Of course, after Yuan Shu proclaimed himself emperor, his followers abandoned him and were wiped out by Cao Cao. On this basis, some people explained that "Dangtugao" is "Wei Que", so Cao Cao took the title of "Wei", which not only inherited the historical tradition of Wei in the Warring States period, but also deliberately did it. Of course, the credibility of this statement is still controversial.