Oh what a tangled web they weave, its only themselves that they deceive.
In "1984" it was handled very smoothly -- "We have always been at war with Eastasia."
In real life, such changes become ... messy.
Great point!
I am reminded of many of the Communist front groups prior to WWII that were demonstrating in the USA for US involvement in the European war to fight the Germans, then, when Hitler and Stalin signed the pact, they changed their placards to plead for isolationism, and for the US not to become involved in the war.
Then, when Hitler invaded the Soviet Union, they simply dropped their placards and held up new ones imploring the US to fight the menace of Germany.
In retrospect, we can all roll our eyes, but hey, it is the exact same thing liberals and the media do quite effortlessly today.
If something becomes more expedient, without any explanation or shame, they change their colors in midstream and carry on as if nothing happened.
Think Eurasia and Eastasia.