This reminds me of another book which I can highly recommend.
"The 4th Turning" by Strauss&Howe.
The thesis is that in free societies history is cyclical. One full cycle is a long human lifetime (~80 years) and it has 4 stages.
At the end of the cycle, a great crisis happens. (WW2, American Civil War).
We're currently entering the end of the current cycle (WW2 is 75 years ago).