Hypothetically, if governments wordwide just suddenly became authoritarian and deleted all records of history, you and some survivors escape to a remote area outside of government control, they all can’t remember much from history (either didn’t pay attwntion in class, or suffers memory loss from the governemtn attacks) and so you are designated as this community’s official historian. How much can you remember? What’s gonna be the official narrative of your little rebel community?
How would you prove that your books reflect the true history?
Ok, I see what you mean. Counterpoint: how could/would anyone? If someone wanted to have “faith” enough they could feasibly handwave away anything that didn’t jive with what they wanted the past to be. And in a situation where cross referencing would be nigh on impossible? I mean…I’ve got nothing. “Trust me bro.”