Millenarianism is is defined as “the belief by a religious, social, or political group or movement in a coming fundamental transformation of society, after which “all things will be changed”.
I ran across this concept in a fascinating book by John Gray called “Black Mass” where he explored how humans have consistently been drawn toward millenarianist movements. He goes through the history and characteristics of these movements and also applies it to the then current movement to go to war against Iraq during the GW Bush presidency. He showed how their campaign and the associated propaganda embodied many of the traits of these kind of movements.
If you read the book, you can probably skim the parts about the early 2000s, but the broader perspective on these movements and how they continue to occur throughout history was eye opening. Once you become aware of these tendencies you see them everywhere.
Gray highlights many historical examples of religions, social movements and political regimes that embrace a certain way of thinking. Over the last ten years, it is easy to see how many of these same tendencies have become supercharged and A/B tested through social media.