The decades-long process by which Spanish expeditions toppled the largest states in the Americas — the Aztec Triple Alliance in 1521 and the Inca realm after 1532 — and built an empire across two continents. The conquest ran less on European weaponry than on epidemic disease, the political fractures inside Indigenous empires, and the tens of thousands of Indigenous allies who fought alongside the newcomers. Out of it came the encomienda labor system, a vast silver economy, and a tangle of conquest myths that historians have spent decades dismantling.
A few hundred Spaniards did not, on their own, bring down empires of millions. That sentence overturns the story most people learned. The conquistadors were outnumbered by enormous margins, often lost, and survived as much by luck and betrayal as by skill. What actually toppled the Aztec and Inca states was a combination of forces the Spanish neither controlled nor fully understood: smallpox racing ahead of the armies, civil wars already splitting the empires, and tens of thousands of Indigenous warriors who saw in the strangers a tool against their own overlords. The conquest was real, and its violence was real. But how it happened is almost the opposite of the legend.