Why did Zhao Gao destroy the letter written by Qin Shihuang to Fu Su and falsely claimed that Hu Hai was a prince?

Because Zhao Gao knows who is the most controllable person, if he supports his son Fuxi according to the will of Qin Shihuang, then he knows that he will not live long. Although Fu Su is benevolent in governing the country, he is also a particularly thoughtful person. Unlike Hu Hai, Zhao Gao's calligraphy is more powerful. He taught Hu Hai to write, so he knows what kind of person Hu Hai is. He has no thoughts of his own and is much more controllable than Fu Su. So on balance, it is better to tamper with the imperial edict.

Moreover, his son Fu Su was a man who dared to disobey Qin Shihuang. Why didn't Fu Su follow Qin Shihuang's parade? It was because he opposed Qin Shihuang's "burning books to bury Confucianism" that he angered Qin Shihuang, so he was sent to Meng Tian's army to build the Great Wall with Meng Tian to resist the Huns. Later, Qin Shihuang died and died on the sand dune platform. Zhao Gao and others concealed the death of Qin Shihuang in order to prevent the news from leaking.

Zhao Gao and Reese discussed giving Fu Su a false imperial edict, asking Fu Su to commit suicide. Fu Su is a filial son. He said you let the minister die, and then he killed himself. But Meng Tian didn't believe it. He didn't receive the news of Qin Shihuang's death, so he went to verify it alone and never came back. At that time, all the armies of North Korea had been controlled by Hu Hai. If Meng Tian knew about Qin Shihuang's death,

So life is so dramatic. If Qin Shihuang had established a prince earlier, Hu Hai and Zhao Gao would not have conspired to tamper with the imperial edict, and Fu Su would not have committed suicide for his filial piety. It is estimated that the Daqin Empire will exist for more than ten years or even longer, and Hu Hai will not perish after three years.