That is also what happened with Adolf Hitler, but obviously mention of Hitler brings in Godwin's Law
Ah well, you don't really need a conspiracy for the War on Terror to be seen as the start of a perpetual war - the simple fact that the War on Terror is a war against a concept, like the war against the Brotherhood - anyone who was a rebel was said to be in league with the Brotherhood, anyone the US government disagrees with is said to be a terrorist. The Brotherhood is bad, terrorists are bad, and there's barely ever any question otherwise.
Obviously in the real world "War is Peace" isn't yet going to go down quite as perfectly, because we do't have forced obedience yet - the government simply uses certain agendas to screw over those they disagree with (if they should so wish), like when McCarthy painted anyone who hated him as having communist connections.
That's one thing I noticed and read before - dystopian fiction could easily be a form of propaganda which helps keep ****ty governments in power, because people read this fiction, and think "no matter how bad our government is now, at least it's not as bad as this". It's like in 1984 where the Party make out as if today's situation is better than yesterday's (the ration went down in value, but they made it look like it went up) using propaganda, to make people think that things were actually getting better. You could also say that they attempt to convince us that we've never had it as good as we do today, and I can't really validly dispute that, but it's a point for thought.