A quote from an essay by George Orwell that he wrote in 1946 on the Prevention of Literature is spot on for today:

1/

From the totalitarian point of view history is something to be created rather than learned. A totalitarian state is in effect a theocracy,

2/ and its ruling caste, in order to keep its position, has to be thought of as infallible. But since, in practice, no one is infallible, it is frequently necessary to rearrange past events in order to show that this or that mistake was not made, or that this or that imaginary

3/ triumph actually happened. Then, again, every major change in policy demands a corresponding change of doctrine and a revaluation of prominent historical figures. This kind of thing happens everywhere, but clearly it is likelier to lead to outright falsification in societies

where only one opinion is permissible at any given moment. Totalitarianism demands, in fact, the continuous alteration of the past, and in the long run probably demands a disbelief in the very existence of objective truth. f/