A war is a battle that is fought between two or more nations, often with disastrous consequences. What is meant by the phrase “but [we] have been incapable of getting rid of the mentality created by the war” is;
When a war occurs it is often hard to extinguish the effects it might have caused. There might be lingering hatred and animosity between the warring nations.
Thus, when the speaker says that they would not be able to get rid of the mentality created by the war, he meant that there will always be an internal conflict between the nations that fought.
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