In the "Five Nations' Attack on Qi" war during the Warring States period, Chu did not participate, and the reasons behind this are worth exploring in depth. According to historical data, we can see that Chu was going through internal and external troubles at that time, and had no time to attend to other matters.

Firstly, there was severe power struggle within Chu. During the reign of King Huai of Chu, his suspicion and exclusion of his ministers led to intensified internal conflicts in the court, and the power struggle became increasingly fierce. This internal conflict and conflict made it impossible for Chu to focus its attention externally.

Secondly, Chu suffered a defeat in its war with Qin. In 312 BC, Chu was defeated by Qin in the Battle of Lantian, and its national strength was greatly reduced. After that, Chu was always under the threat of Qin and was unable to fully participate in the war against Qi.

Thirdly, the geographical location of Chu is also an important factor. Located in the Yangtze River basin, Chu is far away from Qi. If Chu wants to participate in the war against Qi, it must pass through the territory of other countries, which undoubtedly increases the difficulty for Chu to participate in the war.

In summary, we can see that the reason why Chu did not participate in the "Five Nations' Attack on Qi" was mainly due to its internal difficulties and external pressures. The absence of this war also reflects Chu's international status and strength at that time.

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