After the fall of Shu Han, Cao Wei and Eastern Wu became the main powers of the Three Kingdoms period in China.
When Shu Han fell, the Western Jin Dynasty did not immediately launch an attack on Eastern Wu, but delayed for fourteen years before starting to conquer Eastern Wu, which involved a variety of complex factors.
The Western Jin Dynasty itself was riddled with internal problems. After the establishment of the Western Jin Dynasty, although Sima Yan, Emperor Wu of the Jin Dynasty, achieved unification, he faced many political and military difficulties.
In the early years of the Western Jin Dynasty, there were unstable factors at home and abroad, and the regime was not yet stable, and it took time to consolidate domestic unity.
The internal problems of this period included local secession, popular uprisings, and eunuch interference, and it took time and energy to deal with these problems.
After the fall of the Shu Han Dynasty, the strength of Eastern Wu has recovered after a period of rest and rectification.
Sun Quan, the ruler of Eastern Wu, took a series of measures, including strengthening military construction, improving domestic governance, and implementing lenient administration, which enabled Eastern Wu to stabilize.
When the Western Jin Dynasty decided to launch an attack on Eastern Wu, Eastern Wu was no longer in a weak state when Shu Han was destroyed, but had a certain ability to resist.
Geographical factors also had a certain impact on the actions of the Western Jin Dynasty. Dongwu is located in the Yangtze River Basin, the terrain is dangerous, the transportation is inconvenient, to conquer the Dongwu need to overcome many difficulties, which is also one of the reasons why the Western Jin Dynasty did not dare to act rashly.
In this regard, Sun Wu took some measures to strengthen his own defenses, such as building defensive lines and preparing military rations, which made it difficult for the Western Jin Dynasty to conquer Eastern Wu.
There were also external factors, such as the threat of ethnic minorities in the north, that also distracted the Western Jin Dynasty. The Western Jin Dynasty needed to deal with threats from the north and maintain the security of the country, which also limited operations against Eastern Wu.