When does the Lord of the Flies appear?

Just after the Atomic Bomb was dropped on Japan

The period in which Lord of the Flies takes places is not mentioned in the book. As an ejectable aircraft 'passenger tube' and a nuclear war against 'The Reds' are both mentioned it would probably be safe to place the time frame as being set during some imagined future nuclear war against communism.

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Lord of the Flies does not take place in a future imagined war - it took place during the early years of the Cold War in which the USA was against the USSR in the fight for nuclear weapons.

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The future? What? No it took place in World War II Haha :)