It's been years since I read Guns, Germs and Steel, but I think I remember the one or other thing. Off the top of my head: north/south axis of the Americas vs East/West of Europe/Axis - same crops can grow everywhere. No big mammals suitable for herding had survived in the Americas, sweetcorn only crop suitable for breeding for agriculture. Writing may have been discovered in some places for fun, but discarded becaus…
I haven’t read the book, but the axis argument needs a ton of support since it’s absolutely not true that the same crops were or could be cultivated at the same latitudes in Eurasia, in part because the same latitude still has a lot of different climates. For most of history, any given crop was confined to a pretty small area in Eurasia. It’s also certainly not true that there were no large mammals in the Americas su…
It has been 18 years since I read the book, so perhaps you shouldn't judge it by my memories.
Also curious about your source for the crops confined to a small areas.