In the chaotic era of the Three Kingdoms, although Cao Cao painstakingly unified the north, Sima Yi was more tolerant than him. With the secret of "longevity and forbearance", Sima Yi successively killed the Wei Emperor Cao Pi and the Wei Ming Emperor Cao Rui, and finally seized Cao Wei's world. But what Sima Yi did not expect was that Cao Cao actually left a secret plan before his death, and after 94 years, the Western Jin Dynasty quickly collapsed, so what small actions did Cao Cao make before his death, so that Sima Yi, a scheming person, could not detect it?
It turned out that after the Battle of Guandu, the remnants of Yuan Shao fled to Wuhuan, in order to crush the remnants of Yuan Shao in one fell swoop, so in 207 AD, Cao Cao led a large army to launch a fierce battle at the White Wolf Mountain and the leader of the Wuhuan tribe, Jian Dundanyu, in this battle Cao Cao won a complete victory, not only captured more than 200,000 elite cavalry of ethnic minorities, but also completely eliminated the remnants of Yuan Shao's forces.
After experiencing this battle, although Cao Cao won the victory, he also found that the cavalry combat effectiveness of the ethnic minorities in the north was very strong, so how could the inhabitants of these ethnic minorities be stabilized? So Cao Cao thought of a clever plan, that is, to let the Northern Wuhu (Xiongnu, Xianbei, Xianbei, Xian, Qiang, Qiang) move inland, so in the Three Kingdoms period, the internal migration of ethnic minorities formed a climax.
Sima Yi was unaware of this until his grandson Sima Yan, the Emperor Wu of Jin, ascended the throne, and the Hu people had poured into Guanzhong and the Weishui Valley, and formed a siege of Luoyang, the capital of the Western Jin Dynasty. In the process of ethnic integration, many poor people of ethnic minorities and Han nationalities were forced to sell themselves into slavery, and the contradictions between ethnic groups were already extremely acute, and once the rulers of the Western Jin Dynasty were unable to control the central government, the country would soon fall into chaos.
Soon after, Sima Yan died, and his son Sima Zheng, the Emperor Hui of Jin, took the throne, and he was notoriously an idiot emperor, so soon the Western Jin Dynasty fell into civil unrest. During this period, the minority regime also expanded its territory in the north, and in 304, Liu Yuan established Former Zhao and sent his son Liu Cong to attack the Western Jin Dynasty, which soon defeated the Western Jin Dynasty. In November 316, Sima Yi, the Emperor of Jin, surrendered to Former Zhao, and the Western Jin Dynasty was completely destroyed. I am afraid that Sima Yi himself did not expect that a minority policy implemented by Cao Cao in the beginning would actually harm his descendants so badly, and it seems that in the end, Cao Cao was a high-ranking chess player.