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 can recall the gist of European history from year 900 through 1850ish. Then in a lot more detail after that. Outside of Europe my history knowledge is mostly a subsection of European colonialism.