From the totalitarian point of view history is something to be created rather than learned. A totalitarian state is in effect a theocracy, 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 triumph actually happened. Then, again, every major change in policy demands a corresponding change of doctrine and a reevaluation 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. The friends of totalitarianism in this country usually tend to argue that since absolute truth is not attainable, a big lie is no worse than a little lie. It is pointed out that all historical records are biased and inaccurate, or, on the other hand, that modern physics has proved that what seems to us the real world is an illusion, so that to believe in the evidence of one’s senses is simply vulgar philistinism. A totalitarian society which succeeded in perpetuating itself would probably set up a schizophrenic system of thought, in which the laws of common sense held good in everyday life and in certain exact sciences, but could be disregarded by the politician, the historian, and the sociologist. Already there are countless people who would think it scandalous to falsify a scientific textbook, but would see nothing wrong in falsifying a historical fact. It is at the point where literature and politics cross that totalitarianism exerts its greatest pressure on the intellectual. The exact sciences are not, at this date, menaced to anything like the same extent. This difference partly accounts for the fact that in all countries it is easier for the scientists than for the writers to line up behind their respective governments.

George Orwell, “The Prevention of Literature“

Much of what Orwell said continues to hold true, however, we are now at a later date, one in which the sciences are no longer exempted from these kinds of pressures.