How did Emperor Wendi become emperor?

After Lv Hou's death, Liu Bang's old minister and Liu Bang joined hands to destroy Lu, and then discussed who would succeed to the throne, not Li Kasi, the little emperor of Lu at that time. They think that Ricas is not a descendant of Hui Di and does not conform to the legal system of succession to the throne. Finally, they chose Liu Heng, the acting king who is famous for his generosity and kindness. So he sent messengers to meet Liu Heng and go to Chang 'an to inherit the throne. Liu Heng was not very happy when he saw the messenger. On the contrary, it made him suspicious. His ministers also have different opinions. Some think it is a conspiracy, and some analysis will not be false. Liu Heng decided to use divination to determine good or bad luck. As a result, a great divination result was obtained. This result means that the line cracked by Daheng is very legal. I will soon become a king, inheriting the great achievements of my father, just like the continuation of Yu. The soothsayer explained to him that the heavenly king is the son of heaven, one level higher than the general king now. In order to prevent one thousand, Liu Heng was careful step by step in the process of heading for Chang 'an, for fear that he would fall into the trap again and die in the grave. One is to send my uncle Zhao Bo to Chang 'an to find out the truth, and the other is to send his subordinate Chang Song to explore the advanced city when he is fifty miles away from Chang 'an. Finally, with the support of Chen and other ministers, he succeeded to the throne safely and lived in Weiyang Palace.