In the ancient history of China, the establishment and development of the Tang Dynasty is a noteworthy process. Among them, the struggle between Li Shimin and Li Jiangcheng is particularly noteworthy. As the legitimate eldest son of Li Yuan, the founder of the Tang Dynasty, Li Jiangcheng was originally the crown prince of the Tang Dynasty, but he was ultimately deposed by his younger brother Li Shimin. So, why did Li Jiangcheng have no defense against Li Shimin?

Firstly, from the perspective of family relations, Li Jiangcheng and Li Shimin are brothers with a deep blood relationship. During their early growth, they experienced the rise and fall of the family and the baptism of war together, and established a profound relationship with each other. Therefore, in the subconscious, Li Jiangcheng may not have regarded Li Shimin as a potential threat.

Secondly, from the perspective of personality traits, there are obvious differences between Li Jiangcheng and Li Shimin. Li Jiangcheng has a gentle and kind personality, while Li Shimin is intelligent and decisive. Within the family, Li Jiangcheng has always played the role of family leader, while Li Shimin has mostly played a role of assisting and supporting. This division of labor made Li Jiangcheng largely ignore the threat of Li Shimin.

In addition, from the perspective of political situation, the Tang Dynasty at that time was in its early stage, and various forces were competing fiercely. As the crown prince, Li Jiangcheng's main focus was on how to handle the relationship with ministers and vassals to ensure his stable position. In this process, he may have overlooked the threat from his younger brother.

However, fate played a cruel joke on Li Jiangcheng. In the Xuanwumen Coup, Li Shimin successfully seized the throne with his decisive decision-making and meticulous planning. While Li Jiangcheng, due to his lack of defense against his younger brother, ultimately lost the opportunity that should have belonged to him.

In summary, the reason why Li Jiangcheng had no defense against Li Shimin was mainly influenced by their profound family feelings, personality differences, and the complex political situation at that time. However, it was this negligence that led to Li Jiangcheng's ultimate failure. This historical event reminds us that when facing the entanglement of family affection and political interests, we need to carefully weigh the pros and cons to avoid missing opportunities.

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