That reminds me of one of the things that stuck with me from The Man in the High Castle (the book). The main story is an alternate timeline where the Nazis/Japanese won WWII and conquered America. Then there's an alternate-timeline-within-the-alternate-timeline where America/Britain won WWII, but it's not our timeline (and it's hinted there that the liberal US was eventually defeated by a British Empire gone full authoritarian). Everything passes away. The good guys sometimes win, but eventually they lose too.