The theme that the author set up in the story is about the dangers of totalitarianism.
It should be noted that a theme simply means the main idea or the underlying message that's conveyed by the author in the story.
It should be noted the book 1984 is about the extreme level of control that we've in the society. In this case, the theme that the author set up in the story is about the dangers of totalitarianism.
It also shows the role that government plays in the society. To me, belonging isn't a bad thing.
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