During the period of Emperor Wu of the Han Dynasty, the national strength of the unified empire was quite strong. But there are three main problems. First, the vassals still have certain political and military power, which is an unstable factor; Second, land annexation is serious, social unrest and class contradictions are constantly developing; Third, the Huns invaded constantly, and the two Vietnam constantly created troubles, which made the border of the Western Han Dynasty restless. These three factors prompted Emperor Wudi of the Han Dynasty to further strengthen centralization and avoid the situation of internal disintegration before foreign enemies attacked the DPRK.

As for the order of promotion, according to the Biography of the Father of Historical Records in A.D., the founding father strictly said that the ancient governors were only a hundred miles apart, and the shape of strength was easy to control. Today's princes may be linked together dozens of times, and the territory is thousands of miles away. If they are slow, they will be arrogant and extravagant, and they will easily become fornicators. When they were in a hurry, they stopped them, and they joined forces to disobey the capital. If you cut it like this, the knots will sprout, just like Chao Cuo did the day before yesterday. Today, there are dozens of princes and grandchildren, but they are suitable for generations to come. Although the rest are flesh and blood, there is nowhere to seal, and the way of benevolence and filial piety is unknown. May your majesty ask the princes to love his son and treat him well. Everyone likes to get what they want. He is kind to his country so that it can be divided. It's not cut, it's weaker. So I will follow its plan.

Let's make it clear first: using his father to suppress his plan, so that the princes can divide their sons privately, while Han is a self-appointed title, so it belongs to Han County. Han has great kindness, and I have a slight analysis of weak clouds.

Write: During the hundred years of the Han Dynasty, relatives were poor, princes were arrogant and extravagant, evil ministers plotted fornication, old people rebelled, and young people disobeyed the law, endangering their lives and subjugating the country. The most serious one was the Seven Kingdoms Rebellion launched by King Wu and King Liu during the Jingdi period. The country spent three months mobilizing a large number of troops to suppress the rebellion. When he arrived at Emperor Wu of the Han Dynasty, the emperor visited Gugalj, so that the governors had to push American countries and cities. There is nothing left because of the favor order, which is divided into seven, six, five and three.

Year; Imperial edict of Liang Wudi: I will name a vassal king or a person who wants to be partial to his children in every article.

In the first month of the second year of Yuan Shuo, the imperial edict said: Liang Wang and Wang Chengyang were born together, and they would like to take their city as their brother, so they agreed. I will visit the prince who invited their children. So they can rank. So the vassal States began to split and the children were finished. The records of these historical materials reflect the political talent and foresight of Emperor Wu of the Han Dynasty.