Jared Diamond
There is a question that polite academic culture has spent decades trying not to ask directly, even as it sits at the foundation of nearly e
Jared Diamond
The Question That Won’t Go Away
There is a question that polite academic culture has spent decades trying not to ask directly, even as it sits at the foundation of nearly every debate about global development, colonialism, and human difference: why did certain societies end up conquering, displacing, or dominating others? Jared Diamond, a physiologist-turned-biogeographer who spent decades doing fieldwork on bird ecology in New Guinea, decided in the mid-1990s to answer it head-on. The catalyst, as he tells it, was a deceptively simple question posed to him by a New Guinean politician named Yali: “Why is it that you white people developed so much cargo and brought it to New Guinea, but we black people had so little cargo of our own?” Diamond took this seriously — not as a naïve question but as a profound one — and spent the next several years constructing an argument that the answer lay not in the biology or intelligence of different peoples but in the geography and ecology of the continents they happened to inhabit.
The result was Guns, Germs, and Steel (1997), which won the Pulitzer Prize and became one of the most widely read works of nonfiction in the last fifty years. It is a book that professional historians love to criticize and that millions of readers found genuinely illuminating. Both reactions tell you something important about what Diamond accomplished and where his framework breaks.
The Argument: Axes, Animals, and Accident
Diamond’s central thesis is a chain of environmental causation. Eurasia, he argues, had overwhelming advantages in the lottery of domesticable plants and animals. The Fertile Crescent alone offered wheat, barley, peas, lentils, and flax — calorie-dense, storable, easily cultivated crops. Eurasia also had the vast majority of large mammals suitable for domestication: horses, cattle, sheep, goats, pigs. Sub-Saharan Africa, the Americas, and Australia were far less well-endowed in this regard, not because their inhabitants were less inventive but because the local megafauna had either been hunted to extinction or were temperamentally unsuitable for domestication (zebras are famously uncooperative).
The second crucial variable is continental axis orientation. Eurasia runs predominantly east-west, meaning that crops and livestock domesticated at one latitude could spread thousands of miles along similar climatic bands. The Americas and Africa run predominantly north-south, creating sharper ecological gradients that impede the diffusion of agricultural packages. A crop adapted to the Mexican highlands doesn’t easily transfer to the Mississippi Valley. This geographic brake on diffusion slowed the accumulation of the agricultural toolkit that, in Diamond’s schema, is the prerequisite for everything else: sedentary populations, surplus food, specialization of labor, political complexity, writing, technology, and eventually the military capacity to project power across oceans.
The “germs” part of the title is equally critical. Dense agricultural societies living in close quarters with domesticated animals became incubators for zoonotic diseases — smallpox, measles, influenza. Over centuries, Eurasian populations developed partial immunological resistance. When Europeans arrived in the Americas, their pathogens did the bulk of the conquering. Diamond estimates that epidemic disease killed up to 95% of indigenous Americans. This is not a controversial claim among epidemiologists and historians; what Diamond did was integrate it into a single causal narrative stretching back to the Pleistocene.
What the Critics See
The professional critique of Diamond comes from several directions, and much of it has real teeth. Historians object to what they see as environmental determinism — the reduction of complex, contingent historical processes to a handful of geographic variables. Why did Spain colonize the Inca Empire and not the other way around? Diamond says: geography. But this doesn’t explain why Spain and not, say, China — which had comparable geographic advantages and was technologically ahead of Europe for most of recorded history. Diamond addresses this briefly with his “optimal fragmentation” argument (Europe’s political balkanization spurred inter-state competition), but the treatment is thin relative to the weight it has to bear.
Anthropologists raise a different concern: Diamond’s framework, for all its anti-racist intent, can inadvertently strip non-European peoples of historical agency. If everything is determined by the distribution of domesticable grasses and tractable ungulates, then the specific choices, innovations, resistances, and political formations of people in Africa, the Americas, and Oceania become background noise. The irony is sharp — an argument designed to refute racial essentialism can end up committing a different kind of erasure, substituting environmental fate for biological fate while leaving the affected peoples equally passive in the narrative.
There is also a methodological objection. Diamond works at a scale of 13,000 years, and at that resolution, almost any pattern can be made to seem inevitable. Historians who work at the scale of decades or centuries see contingency everywhere — decisions by individual rulers, plagues that hit at precisely the wrong moment, battles won or lost by chance. Diamond’s framework is unfalsifiable in a strict sense: if a society with “good” geography didn’t develop state-level complexity, there’s always a post-hoc environmental explanation available.
Adjacent Resonances
Despite these critiques, Diamond opened intellectual space. His work sits at the intersection of biogeography, archaeology, evolutionary biology, epidemiology, and comparative history — a combination that almost no one else was attempting at that scale. He made it respectable again to ask big “why” questions after decades of academic specialization had made such questions seem naïve. You can draw a direct line from Guns, Germs, and Steel to the “deep roots” literature in economics (Oded Galor’s The Journey of Humanity, Daron Acemoglu and James Robinson’s Why Nations Fail, which offers an institutional rather than geographic counterargument). The empirical work on the Columbian Exchange, the biogeography of domestication, and the role of disease in colonial conquest has only grown richer since Diamond wrote.
His later work extends the framework in interesting directions. Collapse (2005) examines societies that destroyed themselves through environmental mismanagement — Easter Island, the Norse Greenland colony, the Maya — and the book functions as a cautionary parable for climate change, though its historical accuracy has been challenged on several case studies (the Easter Island narrative, in particular, has been substantially revised by archaeologists). The World Until Yesterday (2012) draws on his New Guinea fieldwork to compare traditional and modern societies, and it’s the most ethnographically grounded of his popular books, though it has been criticized for generalizing across vastly different cultures.
What Remains Genuinely Interesting
The most durable contribution of Diamond’s work, I think, is not any specific causal claim but the shape of the question he legitimized. Before Guns, Germs, and Steel, explanations for global inequality tended to cluster around two poles: racist pseudoscience (which attributed differential development to inherent biological capacities) and culturalist arguments (which attributed it to values, institutions, or “work ethic” — often a polite recode of the same impulse). Diamond introduced a third pole: material, ecological, and geographic constraint. Even if his specific chain of causation is too neat, the insistence that you have to take the physical substrate seriously — the crops, the animals, the pathogens, the shape of the continents — permanently enriched the conversation.
What remains unresolved is the interaction between Diamond’s environmental factors and the institutional factors emphasized by economists like Acemoglu. Geography shapes the menu of possibilities; institutions determine which items get ordered. But how exactly the former constrains the latter — and whether geography’s influence fades as technology advances — is still a live question in development economics and historical sociology. Diamond’s framework is strongest for the period between the Neolithic revolution and roughly 1500 CE. After that, institutions, ideas, and contingent political choices take over in ways that continental axis orientation simply cannot explain.
A Closing Note
I keep returning to Yali’s question. Not because Diamond answered it definitively — he didn’t — but because he took it seriously as a scientific question rather than deflecting it into politics or ideology. The answer is surely more complicated than any single book can capture. But the act of constructing a falsifiable (or at least arguable) framework, grounded in ecology and biogeography rather than in the innate superiority of any group of humans, was a genuinely important intellectual move. The book’s weaknesses are the weaknesses of ambition. I’d rather have a flawed attempt to explain 13,000 years of human history than a perfectly rigorous monograph explaining why one particular grain tax in one particular province changed hands in 1347. We need both. Diamond reminded a wide audience that the big questions are still worth asking, even — especially — when the answers are incomplete.