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Tenochtitlan, the Aztec capital built on an island in Lake Texcoco, housed an estimated 200,000-400,000 people at its height in the early 1500s — larger than most European cities of the same period, and connected to the mainland by causeways wide enough for ten horsemen to ride abreast.
An empire built through tribute, not direct rule
The Aztec Empire, more accurately called the Triple Alliance of Tenochtitlan, Texcoco, and Tlacopan, controlled roughly 5 million people across central Mexico without directly administering most conquered territories. Subject cities kept their own rulers and governance in exchange for regular tribute payments in goods, labor, and captives, which made the empire efficient to maintain but also left deep resentments that later worked directly against it.
Human sacrifice was real, ritualized, and central to Aztec religious life
Aztec cosmology held that the sun required regular offerings of human blood to keep moving across the sky, and sacrifice — most dramatically at the Great Temple of Tenochtitlan — was a genuine, large-scale religious practice, not colonial-era exaggeration invented to justify conquest. Estimates of victims vary enormously by source and era, and Spanish accounts in particular have documented political motives for inflating numbers, but the practice itself is confirmed by both archaeological evidence and pre-conquest Aztec records.
Cortes exploited existing political fractures more than he defeated the empire militarily
Hernán Cortés arrived in 1519 with a few hundred men, a force nowhere close to sufficient to conquer an empire of millions on its own. His actual advantage was alliance-building — the Tlaxcalans and other tribute-paying peoples who resented Aztec domination provided the bulk of the actual fighting force that eventually besieged Tenochtitlan, making the conquest as much an indigenous civil war with Spanish involvement as a purely European invasion.
Disease did more damage than any battle
Smallpox, introduced by Spanish forces and to which indigenous populations had no immunity, killed an estimated 40% or more of the population in the years following contact — a demographic collapse that devastated Aztec society’s capacity to resist far more thoroughly than direct combat losses ever could have.
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