The great Bronze Age empires did not fall to drought or invaders so much as to iron: once anyone could dig ore out of local ground, kings lost their monopoly on weapons.
Three thousand two hundred years ago, Egypt and the Hittites met at Kadesh in Syria with tens of thousands of soldiers and over five thousand chariots. It was the largest battle the world had yet seen.
A few centuries later, both empires were gone, along with Assyria and Babylon. Historians call it the Bronze Age collapse.
An empire's edge was a distant tin mine
Bronze is copper plus tin. To make one bronze sword, the tin had to come from mines thousands of miles away, in what is now Afghanistan or Cornwall, past bandits and hostile states.
So bronze weapons stayed in the hands of kings and nobles, while ordinary people kept using stone and wood. A Bronze Age king could field and supply an army no small city-state could match. That was the whole basis of imperial power.
Iron is everywhere, so anyone can arm themselves
Around 1200 BC people worked out how to smelt iron from the ground. Iron is softer than good bronze, holds an edge worse, and needs far higher temperatures, reached only with a furnace called a bloomery and a pair of bellows.
But iron had one advantage bronze could never match: it is everywhere, sitting in the soil outside your own village. In Iron Age Denmark, the iron came from bog ore in local wetlands, smelted with charcoal from local woods.
So peripheral villages could now arm themselves with weapons roughly comparable to the elite troops of the imperial core. The author calls this iron democratising violence.
More kings, shorter reigns
After iron spread, the Middle East produced no empires on the Bronze Age scale, only a patchwork of small states. Skeletal remains show more deaths from violence in that period, and across Assyria, Babylon and Athens the average reign fell 29 percent.
It still holds today. A few-hundred-dollar drone can take out a tank, and anyone can buy one. AI looks more like tin: everyone can use it, but the switch sits with the handful of companies that own it.
Why it matters
Whether a technology reshuffles power depends less on how advanced it is than on how scarce it is. Bronze Age kings were not safer because their swords were better but because tin came from a few faraway pits; iron erased that, and the empires came apart. The same question decides where drones and AI end up: who can cut off the supply.
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