I am about half way thru the book:
Guns, Germs, and Steel: The Fates of Human Societies (Hardcover)
It is a very interesting book...by Jared Diamond (Author) "A suitable starting point from which to compare historical developments on the different continents from around 11,000 B.C...
A good read. Allow me to recommend "Rubicon: The Last Years of the Roman Republic" by Tom Holland. It covers Rome's transition from Republic to Empire. You'll see many unnerving parallels.