There was another thread that popped up about this, and it was fairly decent, so I will copy paste the replies here:
There are many critiques of this book, it's very controversial, but good read non the less. I think you should read it and then read some critiques. There are often threads on /his/ about it /lit/ and /pol/ also love to hate it.
You can find a bunch of reviews and critiques of it with a little bit of googling, so I recommend read it, think about it, and read some critiques.
The author himself is not a Marxist, but from what I can gather, the book is a decent layman introduction to the concept of historical materialism and how it can be applied as a lens to assess the comparative development of civilizations. Unfortunately, some of the claims made by the author are backed by research that's more than a bit shoddy, and reactionary critics love to pick on the book for that reason, but it's pretty clear most of their ire stems from the fact that they are uncomfortable with having their racial essentialist worldview attacked so directly.
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