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?
I probably can’t remember much aside my own countries history, and even if I wouldn’t be able to give exact years and such. Luckily the whole of English Wikipedia (text-only) is roughly 100GB so I would probably distribute the records or requested articles via the black market. Also, this is basically how people in Cuba get access to internet content.