Aztec Lands, Peoples and Languages

In Late Postclassic central Mexico (about 1350–1521), political power connected the high Basin of Mexico to warmer valleys and distant coastal provinces. The Triple Alliance of Tenochtitlan, Texcoco and Tlacopan formed around 1428 and built a network of tribute, markets and political relations. Mexica refers to the people associated with Tenochtitlan and Tlatelolco, the neighboring island city conquered by Tenochtitlan in 1473; Nahua is a broader label for communities associated with Nahuatl and related cultural traditions; Nahuatl was the dominant language of the alliance states. These terms describe different kinds of affiliation: living in a Nahua community, speaking Nahuatl and owing tribute to the Triple Alliance were not the same thing.

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The Basin as a working landscape

The Basin of Mexico is a high plateau enclosed by mountains. Its linked lakes, shore marshes, slopes and valleys offered distinct resources rather than one uniform farming landscape. Lake and wetland communities gathered fish, waterfowl and other aquatic foods; other zones supplied crops, salt, timber, fibers, animal products, building stone and obsidian. In the southern lakes, shallow water and wet soils supported intensive cultivation.

Chinampas were planted beds built in shallow lakes and marshes, not floating gardens. Farmers laid soil over reed frameworks and used ahuejote, a kind of willow, along the edges to hold the beds in place. Channels between the strips served as waterways and helped keep the plots wet. In the Xochimilco-Chalco area, growers raised maize, beans, squash, chile, tomatoes, amaranth and flowers. This system made the lakeside a productive agricultural zone and connected fieldwork to canoe transport.

Tenochtitlan occupied islands in Lake Texcoco. Much of its later construction reclaimed land from the lake, then fitted streets and canals into a grid. Canoes carried people and goods through the city and across the water; three raised causeways linked it to mainland settlements. Aqueducts brought fresh water to a dense urban population. The island setting therefore joined water transport and nearby food production to the needs of an imperial capital.

Warmer valleys and tribute provinces

South of the Basin, the warmer valleys of Morelos produced cotton and other goods. In western Morelos, Tlahuica elites controlled irrigable land and used that control to collect cotton cloth from local communities. By about 1400, 32 small city-states, or altepeme, were grouped under regional centers including Cuauhnahuac, Tlaquiltenango and Xiutepec. The Triple Alliance conquered these polities in campaigns of the 1430s and 1450s. Local people remained in place and local political units continued to matter; conquest redirected their obligations without replacing the whole population.

Farther east, the Gulf Coast province of Tochpan supplied a different bundle of goods. The Codex Mendoza, painted by Nahua scribes around 1542, records the earlier empire’s tribute demands. On folio 52, seven towns are named within Tochpan; the page depicts patterned garments, warrior costumes, feather shields and bags of feathers, jadeite and turquoise beads, and baskets of dried chile. Such pages show how a province’s distinctive production entered a political relationship with the capital. Tribute was one channel of movement; markets and long-distance exchange also circulated food, salt, wood, medicinal plants and other goods among settlements.

Communities and political ties

The Triple Alliance was a partnership of three city-states, with Tenochtitlan becoming the leading power. Texcoco and Tlacopan retained their own rulers and political centers. Beyond the three capitals, the network included regional centers, tributary provinces, smaller towns and villages. A community could owe goods or service while continuing to be governed through its own local institutions.

Tlaxcallan, a Nahua confederation, remained independent despite being surrounded by the alliance. Shared Nahuatl speech or a wider Nahua identity did not automatically make a community an ally of Tenochtitlan.

Language and communication

Central Nahuatl was the dominant language of the Triple Alliance states and was widely understood beyond them. It served as a lingua franca, a shared language used between people whose first languages differed. The alliance’s political subdivisions did not simply follow language boundaries, and neighboring communities spoke languages including Otomí, Matlatzinca, Mazahua, Totonac, Mixtec and Zapotec. Tribute and political control could cross those divisions without erasing local speech.

The Florentine Codex, a history compiled by Franciscan friar Bernardino de Sahagún with Nahua elders, authors and artists, was completed in 1577. Its colonial-era account of preconquest trade describes Mexica merchants entering unconquered Tzinacantla in local clothes and using its language, exchanging obsidian blades, needles, bells and rabbit-hair thread for amber, long plumes and animal skins. Recognition could expose them to death. On returning through Tochtepec, they changed back into Mexica dress and reported what they had seen to senior merchants, who then informed the ruler. The account shows that disguise and local speech made dangerous exchange possible, while merchants also gathered information for their rulers.

During the initial encounters with Cortés’s expedition in 1519, Malintzin interpreted Nahuatl into Maya and Jerónimo de Aguilar translated Maya into Spanish; for Cortés’s replies, they reversed the chain. Historian Patrick Johansson notes that this relay operated before Malintzin learned Spanish, so it describes the first meetings rather than her later interpreting. The sequence shows how communication depended on people with overlapping language knowledge.

Settlements and population estimates

The Late Postclassic Basin contained a hierarchy of settlements, not just a dominant capital and scattered farms. Research on the regional settlement pattern identifies roughly fifty urban centers, including the three Triple Alliance capitals, regional centers such as Chalco and Xochimilco, smaller local centers, villages and hamlets. Tenochtitlan and Tlatelolco began as adjacent island cities; Tenochtitlan conquered Tlatelolco in 1473, and the two merged into one dense urban center. Tlatelolco remained the site of the region’s largest market, while Tenochtitlan concentrated imperial government and ceremonial life.

Tenochtitlan’s population around the Spanish invasion is commonly estimated at roughly 150,000 to 200,000. The figure is reconstructed from settlement area, population density and documentary evidence rather than a surviving city census. Historian and archaeologist Linda Manzanilla reports Jeffrey Parsons’s reconstruction of roughly 1.2 million people across the Basin in the Late Postclassic, based on regional settlement estimates. These totals refer to different geographic scales: Tenochtitlan was an exceptionally large city within a basin of many other inhabited centers.

For the wider setting, see Aztec History and Society.