Orwell states that those who control the present control the past, and those who control the past control the future. Authoritarianism thrives in an environment of ignorance.
Americans have been removed from any genuine, meaningful sense of history for so long that most of us wouldn't recognize truth if it bit us on the hamstring. The parroting of propaganda and cold facts leeched of all meaning has taken the place of history. We see no point in independantly investigating truth. Why bother, when we can just sit down in front of the tube and have talking heads feed us the proper approved summary of world events. This is why you have a majority of Americans who believe that the United States saved the free world in WWII, that we were fighting to protect a democracy in Vietnam and that Sadaam Hussein helped to organize the 9/11 attacks.