The story of Harry Potter is so rich and layered with different plotlines that, with an untrained eye, it’s easy to overlook details that ultimately play a decisive role in the conclusion and reveal various character motivations. One such intriguing detail is that the Chamber of Secrets is never mentioned in the main school textbook — A History of Hogwarts. Let’s explore the reasons behind this subtle yet strategic omission.
Censorship in the Wizarding World
If information about the Chamber of Secrets was deliberately left out of official sources, it suggests that the Ministry of Magic or the Hogwarts administration consciously kept this information hidden. Possible reasons for this could include:
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To protect the school's reputation: If it were confirmed that a monster had once lived in Hogwarts, it could cause panic among parents and students.
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To prevent inter-house conflicts: The revelation that Salazar Slytherin had left a basilisk in the school could have escalated tensions between Slytherin and the other houses.

The Ministry of Magic has shown a pattern of censorship (such as denying Voldemort’s return), so erasing a piece of history fits with their method of control.
History is Written by the Victor
Let’s imagine that after the Chamber of Secrets was first opened (either thousands of years ago or even in the 1940s by Tom Riddle), Hogwarts leadership sought to "rewrite" the history. If information about the Chamber remained in the books, any student could have easily started searching for it.
Perhaps Professor Dippet (headmaster in the 1940s) or Dumbledore (once he became headmaster) purposely ordered the removal of details about the Chamber to prevent further tragedies.

What Else Might Have Been Erased?
If the Ministry or the school’s leadership could hide the existence of the Chamber, it’s reasonable to assume that other dark secrets might have been erased from textbooks as well. For instance:
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The true story of Salazar Slytherin: Perhaps his motives were more complex than just a hatred for Muggle-borns.
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Other hidden rooms at Hogwarts: If the Chamber was concealed, there might be other magical places we don’t know about.
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The true role of Dumbledore in past events: While Dumbledore is portrayed as a hero in the books, later stories (like Fantastic Beasts) reveal that he too hid many truths.

Why Didn’t Hermione Find This Information?
Hermione is the brightest student at Hogwarts, yet she was unable to find anything about the Chamber of Secrets in A History of Hogwarts. This suggests that the information was deliberately hidden, not just overlooked.
If A History of Hogwarts doesn’t contain the full truth, how much can we trust the other books of the magical world? Perhaps even the wizarding world doesn't know its own history as thoroughly as it believes.

Conclusion
At first glance, the lack of information about the Chamber of Secrets in textbooks may seem like a small detail, but it highlights a much larger issue within the wizarding world: the concealment of the truth and manipulation of history. The mysteries of Hogwarts run deeper than we realise, and perhaps wizards know their own history only as much as they are allowed to know.