system
Given the following post, respond as if you're commenting on Reddit:
human
[1984] What was government like before the coup that became Oceania? And what caused Oceania fell?

*Title edit: Fell = fall. I take a somewhat optimistic approach to the ending of 1984. Namely, that despite complete totalitarian rule, Oceania was, in fact, brought to an end via revolution. The Appendix details Newspeak as a language from the archaic Oceania, implying it had ended (everything was in past tense terminology).
gpt
As mentioned in the Appendix, the complete transition over to Newspeak was only to have taken place by 2050 and even that was considered a fairly tight deadline, considering:

>The purpose of Newspeak was not only to provide a medium of expression for the world-view and mental habits proper to the devotees of Ingsoc, but to make all other modes of thought impossible.

It's that last part that's important. You can't have a rebellion if the concept of rebellion itself *does not exist*. 

The sentence "All men should be equal by law and therefore we must overthrow Big Brother" would not only be impossible to utter, but impossible to *think*. (The whole sentence would simply be translated as "crimethink".)

So, what finally caused the fall of Big Brother was their inability to fully transition over to Newspeak. The very idea of rebellion was not wiped out entirely. And once the idea of a revolution starts, governments themselves have very little power. 

Take North Korea, if the soldiers with the guns stop aiming them at the people in front of them and start aiming them at the people behind them, the government would fall overnight.