Even 1984 needed magic to make it work: the mind-reading thought police and, more importantly, the praeternatural voluntary mass amnesia ability, by which the population could forget at the drop of a hat the most widely known facts like the price of rationed chocolate the week before.
If induced selective amnesia becomes medically possible it's the first thing I would legislate as a dictator.
Whoops, let me see if I can rephrase my point regarding the above differently.
If you think on it, that is very possible. First off, make basic living/surviving difficult in and of itself, acquiring food, water, shelter and safety. Make everyday bad, and make it so that every bit of effort in a person's day must be devoted to those aspects. Further, expose them to an environment wherein there is a constant threat of violence, discomfort and suffering.
As they focus on simply staying alive, bombard them with news. Promise that "tomorrow it will get better." Tomorrow the water will be turned on, there will be food, etc.. Do that constantly yet never come through on that promise. After a while of that, begin contradicting that news. Space those contradictions out over days, then hours, and eventually minutes. Make it so that the news cannot be trusted and becomes so ridiculous that it contradicts itself from moment to moment. Hammer the people with that ridiculous news incessantly. Bombarding them as they simply try to survive another second.
In time, the people will not trust the news, more so, just want it to stop so they can focus upon surviving. After enough time, they will not want to hear any news. Life will be so difficult today, that they cannot dwell on the past of yesterday. In time, the misery of today becomes their yesterday. So now not only do they not want to think on their past, they do not want to think on their future in that it always falls short.
Ultimately, only today, perhaps even this moment matters... So, you have re-educated the people to selectively choose not to have a history, or even have hopes for the future. At that point they won't care. The only thing they will wish for is to address the moment, embracing the suffering, in that their past and hopes for the future now only compounds it.
Not quite as concise as before, yet I hope it gets my point across.
K2