The premise of 1984 is that in order to maintain a hierarchy, the fruits of human labour must be destroyed.
Governments can do this in many ways, usually by pissing money (your confiscated money) up the wall on all sorts of bollocks you'd never even think of spending your money on, but the best way is via war.
In 1984 there are 3 empires, we were in Oceania.
These empires are constantly at war, A & B vs C, then B & C vs A, then A & C vs B, then repeat.
The government alters the history records to suit the current situation. Bullshits basically.
It also helps tremendously to have an enemy the people can hate. The people will put up with all sorts of crap in these circumstances.
If you note there's always an enemy. The soviet union was subsidised and fed nuclear secrets. When that bankrupted itself, the current war on no-one in particular will do. Even the fight against global warming, or when that proved bollocks, the ministry of truth changed it to climate change.
Basically, anything to keep us down, and stop our progress.
Their enemy is truth. Especially the internet. Enjoy it whilst you can.