Liu Bei had both the "Sleeping Dragon" and the "Phoenix Chick", two exceptional advisors, who indeed provided him with great assistance in war and politics. However, Liu Bei ultimately failed to unite the land under his rule due to various reasons.

Firstly, Liu Bei's own abilities and strength were limited. Although he was a person with noble sentiments and leadership qualities, his military, political, and economic skills were not outstanding. He failed to grasp the overall strategy of the army and manage his regime effectively, resulting in frequent setbacks in his campaigns.

Secondly, the times were unfavorable to him. China had entered the period of the Three Kingdoms, with severe political fragmentation and various feudal lords governing their own territories and attacking each other. To unite the land in such a situation required exceptional wisdom and ability, which Liu Bei did not possess.

In addition, Liu Bei also had issues in talent selection and utilization. Although he had the "Sleeping Dragon" and the "Phoenix Chick" as his advisors, he failed to fully utilize their talents and wisdom, often being influenced by other generals. This, to some extent, affected his ruling ability.

Lastly, Liu Bei's personality may have also been a factor in his failure to unite the land. He overvalued traditional virtues such as loyalty, friendship, and trustworthiness, often being too lenient with his subordinates and susceptible to others' influence. Such a personality could be easily exploited by rivals in war and led to his loss of control over his subordinates, ultimately preventing him from achieving decisive victories.

Liu Bei also encountered many unfavorable factors and challenges in his quest to unite the land, which were important reasons for his failure.

Firstly, frequent wars occurred during the Three Kingdoms period, with conflicts among various forces lasting for decades. For Liu Bei to unite the land, he needed to engage in wars over a long period, posing a significant test to his military strength and economic foundation.

Secondly, talent competition was fierce among the various forces. Liu Bei encountered great difficulties in this regard, despite having the "Sleeping Dragon" and the "Phoenix Chick" as his top advisors. Other forces also had similar talents, who they competed for and exploited, making Liu Bei's rule and development face enormous challenges.

There were also external factors that negatively impacted Liu Bei's attempt to unite the land. For instance, natural disasters, wars, poverty, and other factors led to people's lives being in dire straits, causing dissatisfaction and resentment toward the ruler. In addition, conflicts and disputes existed among various forces, posing many obstacles and challenges for Liu Bei in his quest to unite the land.

In summary, although Liu Bei had both the "Sleeping Dragon" and the "Phoenix Chick", he ultimately failed to unite the land due to various reasons, including his own abilities and personality, the backdrop of the times, and talent selection.

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