Let’s assume that if Mrs. Sun gave birth to a son, if the Eastern Wu happened to have a major change, Sun Quan died early, if Sun Quan did not have an outstanding heir after his death, the remaining huge foundation of the Eastern Wu was left without anyone to lead. In this case,

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The reason is very simple: making Mrs. Sun's son the crown prince can win over the talents of the Eastern Wu, which is equivalent to accepting all Sun Quan's political heritage at zero cost. Why not do such a good thing?

However, if Sun Quan does not die, or if Sun Quan dies but has an excellent successor, then Eastern Wu is destined to be another political force different from Shu Han. Moreover, the situation in the Three Kingdoms is different from that in the pre-Qin period. Western Zhou , Spring and Autumn , Warring States Period, there were often intermarriages between vassal states. The princess of your country married the king of our country and gave birth to a son to become the prince of our country. But that is under the premise that the princes are united, different national regimes can coexist for a long time.

And after Han Dynasty , the situation of "the unity of the three kingdoms" lasted for decades. Chinese culture determines that China "long separation will lead to unity, and long unification will lead to unity". Split is temporary, and unity is the general trend. Everyone knows this very well.

Therefore, Shu Han and Dongwu are more conflicting than compatible in the long run. The prince is the nephew of the enemy country, which is definitely not conducive to the long-term interests of the country. There is no doubt about this.

Therefore, if the Eastern Wu exists as a political entity, then Mrs. Sun will not be made the crown prince even if she has a son. The reason is easy to find: Liu Chan is the eldest son. Even if Mrs. Sun was made queen, her son was the second son.