Ultrasociety (book review)

Intro:

Peter Turchin continues his scientific exploration of history and the rise and fall of civilizations in his new book: Ultrasociety. I have previously reviewed his 2006 book War and Peace and War and his significant paper published in Nature in 2010 Political instability may be a contributor in the coming decade which warned of the kind of problems we see emerging in many countries today and which predicted a major crisis by 2020.