After the death of Qin Shi Huang, the internal power struggle within the Qin Dynasty became increasingly fierce. Among them, the fate of the two historical figures Fu Su and Meng Tian was particularly noteworthy. If they had joined forces to attack Xianyang, could they have defeated Hu Hai and changed the historical trajectory of the Qin Dynasty? Although this question cannot be answered definitively, we can analyze some possibilities from historical data.

First, we need to understand the backgrounds of Fu Su, Meng Tian, and Hu Hai. Fu Su was the eldest son of Qin Shi Huang and was originally expected to inherit the throne. However, due to the conspiracy of Zhao Gao and Li Si, he was framed and killed. Meng Tian was an outstanding general at the end of the Qin Dynasty. He had led the army to fight against the Xiongnu in the north and established many military achievements for the Qin Dynasty. With the support of Zhao Gao and Li Si, Hu Hai ultimately ascended the throne.

From a military perspective, both Fu Su and Meng Tian had certain strength. As the eldest son of the emperor, Fu Su had some political influence and appeal; Meng Tian was an outstanding general at the end of the Qin Dynasty with rich war experience and command ability. If they could unite, they would indeed pose a certain threat.

However, it was not easy to defeat Hu Hai successfully. First, with the support of Zhao Gao and Li Si, Hu Hai had already grasped the core power of the Qin Dynasty. This meant that he could use the power of the entire country to oppose Fu Su and Meng Tian. Secondly, the Qin Dynasty had already fallen into chaos at that time, with fierce political struggles and exhausted people. Even if Fu Su and Meng Tian could attack Xianyang, they would still need to face a country with internal and external troubles.

In addition, we also need to consider the contingency of history. In the long river of history, the development of many events is often affected by some unexpected factors. For example, the sudden death of an important figure, an unexpected war, etc. These accidental factors may have a significant impact on the actions of Fu Su and Meng Tian, making their plans unable to proceed smoothly.

In summary, although we cannot determine whether Fu Su and Meng Tian can successfully defeat Hu Hai if they unite, from the analysis of historical data, they face many difficulties and challenges if they want to successfully change the historical trajectory of the Qin Dynasty. This question leaves us with endless imagination and also makes us more appreciate the complexity and changeability of history.

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