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Part of the reason why he had a massive technological advantage, though, is that he came from a society that had so many resources to spend on things that are strictly about waging war on its neighbors more effectively. And because its neighbors were also like that - they also had resources to spend on both the tech and the soldiers - both Spain and its opponents were engaged in a brutal never-ending arms race. So when Cortes came to the Americas, he came bearing all the fruit of that. Which in this case was technology, primarily. With respect to food in general, it's not that it's difficult to produce at scale. But your ability to produce food is inherently limited by three factors - the land, the people to work that land, and the tech those people use. Now, pretty much any agricultural society can produce enough food to feed all the people who produce the food (and all other basic necessities besides). Everything past that point is surplus, which can then be spend to feed people who are not producing food. Which is first and foremost the rulers and the priests - and thus you start getting social stratification - but then also artisans (who make tools) and soldiers (who go and conquer more land to farm and subjugate more people to farm it). And, at some point, a portion of those elites - who have enough calories and enough leisure time to waste on "frivolous" activities not having to do with immediate survival - uses that time to do research that eventually translates to better tools. Furthermore, if their society is in a constant state of war with neighbors - as was the case in Europe for most of its history - those tools are likely to be better weapons specifically. Horses are clearly not the single definitive factor here, but I don't see why it couldn't be a significant one. This whole setup I just described is clearly a positive feedback loop, so even relatively minor factors introduced early can compound massively over time. And if horses meant that a single European farmer could produce, say, as much food as two Incan farmers, that's a lot more resources that can be spent on waging war and on figuring out how to do it more efficiently. I should note that the above is not a rehash of Diamond, but rather my own thoughts on this matter. Speaking for myself, I think that it's really the non-stop warfare in Europe, where no single entity managed to unify the entire continent and make it stick for long enough, that was the defining factor in pushing Europe ahead in military science specifically (and other things more or less incidental to that). And then its relatively small size meant that much of this aggressive potential was directed outside of the continent - as military tech progresses, wars of conquest against peer-level neighboring states become less and less lucrative, because you have to spend considerably more resources to conquer the same amount of land and population. Much easier to take all that tech you already have and go curb-stomp some civilization that doesn't have it yet. |
I also have to add that many of the advances we're talking about are not things that require any sort of special preconditions. I can setup a furnace capable of creating and forming steel in my backyard out of clay, straw, wood, and perhaps some leather if I really want to go all out and add a billows. Similarly I can even make gunpowder in my backyard - straw, wood/charcoal, sulfur, urine, and you're good to go! One curious and experimental individual is all it takes to reshape a people.
At least if they're willing to be reshaped. There's a lot of weird things in history. For instance the Zulu were a warlike people, yet their traditional shield was made of cowhide! And it was "real" - not just ceremonial/ornamental. Obviously they were aware of the possibility of making one out of thin wood, which might be a bit heavier yet orders of magnitude more protective - yet they chose not to. Similarly they preferred to fight near naked, as opposed to wearing cowhides - which again, I think it goes without saying they were aware of the possibility of.
Even simple things like fortifications seem to largely have not been a thing in much of the world in spite of never-ending wars. Simple wooden defenses, moats, etc are utterly trivial to construct, and that sets you almost immediately down the technological path towards the massive spiraling castles that would end up dotting the European landscape. But most of these other cultures simply failed to create such things.
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EDIT: You know, thinking about this some more - I can even see this weirdness in our own cultures today. For instance everybody knows that fertility rates are plummeting to the point that most Western societies stand a large risk of simply dying off. Yet most people simply shrug. It may be that the first 'grand reshaping' of Earth was technology, but the second may simply be fertility. And an anthropologist looking back find himself struggling to answer why it was that people simply didn't adapt when the answer was right in front of them. And living through this, perhaps there is no answer - certainly no neat and tidy one.
[1] - https://sci-hub.se/https://www.nature.com/articles/s41562-01... (short and highly readable)