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Polity

Aztec Empire

Aztec Empire (1428-1521 CE) - The Mesoamerican empire that unified central Mexico, established tribute systems, and created foundations for later Mesoamerican governance before Spanish conquest.

Mesoamerican

Overview

The Aztec Empire (1428-1521 CE) was the Mesoamerican empire that unified central Mexico, established tribute systems, and created foundations for later Mesoamerican governance before Spanish conquest. It exemplifies the conquest-integration pattern through tribute systems and administrative consolidation.

Formation

  • Formation Date: 1428 CE - Triple Alliance established
  • Formation Event: aztec empire founded 1428ce
  • Key Actors: Various Aztec rulers
  • Context: Preceded by various Mesoamerican city-states
  • Formation Process: Triple Alliance (Tenochtitlan, Texcoco, Tlacopan)

Persistence

  • Key Periods:
    • Early Aztec (1428-1481 CE): Initial consolidation
    • Classical Aztec (1481-1502 CE): Peak expansion
    • Late Aztec (1502-1521 CE): Decline and Spanish conquest
  • Internal Developments:
    • Tribute systems
    • Administrative and legal systems
    • Cultural achievements (art, architecture, writing)
  • Administrative Structure: Imperial administration, tribute systems
  • Territorial Changes:
    • Peak expansion (1500 CE)
    • Spanish conquest (1521 CE)
  • Key Events:
    • Various conquest, reform, and cultural events

Transformation

  • Major Changes:
    • Tribute Systems: Development of tribute-based administration
    • Administrative Systems: Bureaucratic expansion
    • Cultural Achievements: Art, architecture, writing
  • Key Events:
    • Various transformation events
  • Key Actors:
    • Various Aztec rulers

Dissolution

  • Dissolution Date: 1521 CE - Fall to Spanish conquest
  • Dissolution Event: aztec empire fell 1521ce
  • Dissolution Process: Spanish conquest (Hernán Cortés)
  • Successor Polities:
    • Spanish Empire / New Spain
  • Legacy:
    • Tribute system models
    • Administrative and legal foundations
    • Cultural and institutional models

Quantitative Data

Predecessors

  • Various Mesoamerican city-states (pre-1428 CE)

Successors

  • Spanish Empire / New Spain

Conquests

  • Conquered By: Spanish Empire (1521 CE)
  • Conquered: Various territories in central Mexico

Pattern Relevance

GGS Framework

Conquest Integration Framework

About this entry

A draft entry preserved from civilization.study. Evidence grade: strong. 1 of 2 listed sources are fully documented; the rest are names only. Method and sources

CAD Framework

  • Scale: Institution, Civilization (polity is institutional-scale within Mesoamerican civilization)
  • Time: Formation (1428 CE), Persistence (1428-1521 CE), Transformation (various periods), Dissolution (1521 CE)
  • Space: Core, Network (Central Mexican core, network expansion)
  • Domain: Institutional, Political, Military, Cultural
  • Mechanism: Formation, Persistence, Transformation, Dissolution
  • Type: Example
  • Framework: GGS Style, Conquest Integration

Chronology Framework

  • Event Links:
    • Formation: aztec empire founded 1428ce
    • Dissolution: aztec empire fell 1521ce
  • Temporal Context: 1428-1521 CE

Notes

  • Evidence Quality: Strong - well-documented in Aztec, Spanish, and historical sources
  • Integration: Links to existing events, patterns
  • Future Research:
    • detailed studies of Aztec administrative systems
    • quantitative data for Aztec Empire
    • Expand relationship network

Conflicts

Conflicts this polity is recorded in. Cards are generated from Civitas's war records; every one is a draft estimate and none is Official.

How to read the evidence badges
Primary text read
Civitas read the ancient or primary text for at least one figure on this card. Other figures may still be Wikipedia-compiled and are labelled.
Generic placeholder: an advancing line for a war or campaign. Not an image of this event.
war · c.1427 CE-1428 CE (conventional; not extracted from a source)

Tepanec War and Formation of the Triple Alliance (c.1427-1428 CE, conventional)

Founding war of the Aztec Triple Alliance (Smith 2012; Hassig 1988).

Evidence: Primary text read Draft estimate

What the record says

  • Unverified (Wikipedia-compiled) Wikipedia (Itzcoatl): under Itzcoatl (reign 1427-1440) the Mexica of Tenochtitlan broke free from Tepanec domination and, with Tetzcoco and Tlacopan, founded the Triple Alliance. The war against Azcapotzalco (Tepanec capital) is conventionally dated 1427-1428; the exact dates are NOT given in the fetched infobox. No casualty or strength figures asserted.
  • Candidate sources Candidate formal sources listed in the Wikipedia infobox/lead for this topic (METADATA-VERIFIED ONLY via Crossref/Open Library; NOT read; relevance to the figures above unverified): Townsend Camila 2019, Fifth Sun.
  • Primary text PRIMARY-SOURCE (read 2026-10-12): Duran, Historia t. 1, cap. IX (pp. 69-78): Itzcoatl's election given as "mil y quatrocientos y veinte y quatro" (1424, Duran's date); Tlacaelel led the Mexica; Azcaputzalco was entered and sacked, "no dexando ... ni hombre ni muger ni nino a vida, saluo los que huyendo se auian acoxido a los montes"; the Tepanecs surrendered as "perpetuos tributarios" and ceded lands. No numbers. Sixteenth-century friar's history based on Nahua sources.

Confidence. low-medium (event real; dates conventional).

Where it sits

Sources and evidence

No page-level citation is claimed for any source. Figures marked unverified come from a Wikipedia aggregator and are not for Official use.

Link to this conflict

Generic placeholder: an advancing line for a war or campaign. Not an image of this event.
war series · 1454 CE-1519 CE (per Wikipedia infobox)

Flower Wars (Xochiyaoyotl) (c.1454-1519 CE)

Recurring staged wars between the Aztec Triple Alliance and neighbouring Puebla-Tlaxcala polities; core Mesoamerican inter-polity war case (Hassig 1988).

Evidence: Primary text read Draft estimate

What the record says

  • Unverified (Wikipedia-compiled) Wikipedia infobox span 1454-1519 (65 years); Cholula and Atlixco incorporated into the Aztec Empire; Tlaxcala and Huejotzingo lose trade routes.
  • Note The nature of the wars (ritualised vs. strategic) is debated in the scholarship (Hassig 1988; Smith 2012); no casualty figures asserted.
  • Candidate sources Candidate formal sources listed in the Wikipedia infobox/lead for this topic (METADATA-VERIFIED ONLY via Crossref/Open Library; NOT read; relevance to the figures above unverified): Isaac Barry L. 1983, The Aztec "Flowery War": A Geopolitical Explanation.
  • Primary text PRIMARY-SOURCE (read 2026-10-12): Duran, Historia t. 1, cap. LV (pp. 434-435): "llamauan a la guerra xuchi yaoyotl, que quiere decir guerra florida", and death in war "xuchimiquiztli"; Duran states the history "jamas ... pone el numero cierto" of those who went to war, so he gives none. Definitional only: this passage does not describe the Tlaxcala/Huexotzinco arrangement or a start date; 1454 remains conventional.

Confidence. low-medium (dates per secondary; interpretation debated).

Where it sits

Sources and evidence

No page-level citation is claimed for any source. Figures marked unverified come from a Wikipedia aggregator and are not for Official use.

Link to this conflict

Generic placeholder: an advancing line for a war or campaign. Not an image of this event.
conquest · February 1519-13 August 1521

Spanish Conquest of the Aztec Empire (1519-1521 CE)

Cortes' coalition campaign with Tlaxcalan and other indigenous allies; combined with epidemic disease (Hassig 1994; Restall 2003; Thomas 1993).

Evidence: Primary text read Draft estimate

What the record says

  • Unverified (Wikipedia-compiled) Span February 1519 - 13 August 1521; outcome: Spanish-Indian allied victory (Wikipedia infobox).
  • Unverified (Wikipedia-compiled) Wikipedia (stub): 1,800 Spaniards dead; ~200,000 Aztecs dead including civilians; and "10,500,000 deaths as a result of the conquest" - this last figure bundles epidemic mortality (smallpox, and megadrought/cocoliztli debates, e.g. Acuna-Soto et al. 2002, DOI-verified existence only) and is VERY LOW confidence; do not chart.
  • Note Existing record: event-spanish-conquest-tenochtitlan-1521ce; this record covers the wider campaign and its Tlaxcalan alliance.
  • Candidate sources Candidate formal sources listed in the Wikipedia infobox/lead for this topic (METADATA-VERIFIED ONLY via Crossref/Open Library; NOT read; relevance to the figures above unverified): Acuna-Soto Rodolfo 2002, Megadrought and Megadeath in 16th Century Mexico.
  • Primary text PRIMARY-SOURCE (read 2026-10-12): Bernal Diaz (Maudslay vol. 2, p. 255): over 860 Spanish soldiers killed in five days of the 1520 retreat, plus 72 at Tustepec and over 1,000 Tlaxcalans. A partial campaign figure only; the Wikipedia whole-conquest totals remain unverified.

Confidence. low (casualty/mortality numbers); medium (dates/outcome).

Where it sits

Sources and evidence

No page-level citation is claimed for any source. Figures marked unverified come from a Wikipedia aggregator and are not for Official use.

Link to this conflict

Generic placeholder: crossed lines for a battle. Not an image of this event.
battle · 7 July 1520

Battle of Otumba (1520 CE)

Cortes' retreating army defeats a pursuing Mexica force near Otumba on the way to Tlaxcala.

Evidence: Primary text read Draft estimate

What the record says

  • Unverified (Wikipedia-compiled) Date 7 July 1520 (Julian); outcome: Spanish-Tlaxcalan victory (Wikipedia).
  • Unverified (Wikipedia-compiled) Wikipedia (stub): Aztec 10,000-20,000 warriors; Spanish dead ~60; Tlaxcalan losses and Aztec casualties unknown. Spanish-chronicle based.
  • Primary text PRIMARY-SOURCE (read 2026-10-12): Bernal Diaz (Maudslay transl., Hakluyt 1910) vol. 2, pp. 252-255: the battle turned when the Mexican captain carrying the banner was killed (lance by Juan de Salamanca); "within a matter of five days over eight hundred and sixty soldiers were killed and sacrificed" (including Otumba and the retreat), plus 72 killed at Tustepec, five Spanish women, and "over a thousand Tlaxcalans". Eyewitness participant account.

Confidence. low (chronicle figures).

Where it sits

Sources and evidence

No page-level citation is claimed for any source. Figures marked unverified come from a Wikipedia aggregator and are not for Official use.

Link to this conflict

Generic placeholder: crossed lines for a battle. Not an image of this event.
battle · 30 June-1 July 1520

La Noche Triste (1520 CE)

Spanish expulsion from Tenochtitlan with heavy losses.

Evidence: Primary text read Draft estimate

What the record says

  • Unverified (Wikipedia-compiled) Dates 30 June - 1 July 1520; outcome: Mexica victory (Wikipedia).
  • Unverified (Wikipedia-compiled) Wikipedia (stub): Spanish ~1,000-2,000 and ~12,000 Tlaxcaltec allies; Aztec ~20,000; Spanish killed, drowned or captured 800-1,200; ~4,000 Tlaxcaltecs killed or captured. Spanish-chronicle sources; low confidence. (Bernal Diaz del Castillo is the usual primary source; I could not read an online text of it in this session.)
  • Note SECONDARY-READ figures: Cunninghame Graham 1915, p. 130 (paraphrasing Bernal Diaz; read 2026-10-12): the Spaniards lost "nearly nine hundred soldiers", plus seventy-two left garrisoning a town and five Castilian women; more than 1,200 Indian allies killed; only 23 horses survived. Diaz himself NOT read; treat as Diaz-derived claim.
  • Primary text PRIMARY-SOURCE (read 2026-10-12): Diaz himself (Maudslay vol. 2, p. 255) now read: over 860 soldiers killed in five days (Noche Triste through Otumba), 72 at Tustepec, five Spanish women, over 1,000 Tlaxcalans. Supersedes the secondary paraphrase as the evidence level.

Confidence. low (chronicle figures).

Where it sits

Sources and evidence

No page-level citation is claimed for any source. Figures marked unverified come from a Wikipedia aggregator and are not for Official use.

Link to this conflict

Art: Patterns of Civilization chronicle art, made with AI: illustrations, not historical evidence. Entries are drafts preserved from civilization.study. Method and sources.