The empire known to history as the Aztec state was largely the work of the Mexica (meh-SHEEH-kah) people, a semi-nomadic group from northern Mexico who had migrated southward and by 1325 had established themselves on a small island in Lake Texcoco. Over the next century, the Mexica developed their military capacity, served as mercenaries for more powerful people, negotiated elite marriage alliances with them, and built up their own capital city of Tenochtitlán. In 1428, a Triple Alliance between the Mexica and two other nearby city-states launched a highly aggressive program of military conquest, which in less than 100 years brought more of Mesoamerica within a single political framework than ever before. Aztec authorities, eager to shed their rather undistinguished past, now claimed descent from earlier Mesoamerican peoples such as the Toltecs and Teotihuacán.

With a core population recently estimated at 5 to 6 million people, the Aztec Empire was a loosely structured and unstable conquest state that witnessed frequent rebellions by its subject peoples. Conquered peoples and cities were required to provide labor for Aztec projects and to regularly deliver to their Aztec rulers impressive quantities of textiles and clothing, military supplies, jewelry and other luxuries, various foodstuffs, animal products, building materials, rubber balls, paper, and more. The process was overseen by local imperial tribute collectors, who sent the required goods on to Tenochtitlán, a metropolis of 150,000 to 200,000 people, where they were meticulously recorded.

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That city featured numerous canals, dikes, causeways, and bridges. A central walled area of palaces and temples included a pyramid almost 200 feet high. Surrounding the city were “floating gardens,” artificial islands created from swamplands that supported a highly productive agriculture. Vast marketplaces reflected the commercialization of the economy. A young Spanish soldier who beheld the city in 1519 described his reaction:

Gazing on such wonderful sights, we did not know what to say, or whether what appeared before us was real, for on one side, on the land there were great cities, and in the lake ever so many more, and the lake was crowded with canoes, and in the causeway were many bridges at intervals, and in front of us stood the great city of Mexico.14

Beyond tribute from conquered peoples, ordinary trade, both local and long-distance, permeated Aztec domains. The extent of empire and rapid population growth stimulated the development of markets and the production of craft goods, particularly in the fifteenth century. Virtually every settlement, from the capital city to the smallest village, had a marketplace that hummed with activity during weekly market days. The largest was that of Tlatelolco, near the capital city, which stunned the Spanish with its huge size, its good order, and the immense range of goods available. Hernán Cortés, the Spanish conquistador who defeated the Aztecs, wrote that “every kind of merchandise such as can be met with in every land is for sale there, whether of food and victuals, or ornaments of gold and silver, or lead, brass, copper, tin, precious stones, bones, shells, snails and feathers.”15 Professional merchants, known as pochteca, were legally commoners, but their wealth, often exceeding that of the nobility, allowed them to rise in society and become “magnates of the land.”

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Among the “goods” that the pochteca obtained were slaves, many of whom were destined for sacrifice in the bloody rituals so central to Aztec religious life. Long a part of Mesoamerican and many other world cultures, human sacrifice assumed an unusually prominent role in Aztec public life and thought during the fifteenth century. Tlacaelel (1398–1480), who was for more than half a century a prominent official of the Aztec Empire, is often credited with crystallizing the ideology of state that gave human sacrifice such great importance.

In that cyclical understanding of the world, the sun, central to all life and identified with the Aztec patron deity Huitzilopochtli (wee-tsee-loh-pockt-lee), tended to lose its energy in a constant battle against encroaching darkness. Thus the Aztec world hovered always on the edge of catastrophe. To replenish its energy and thus postpone the descent into endless darkness, the sun required the life-giving force found in human blood. Because the gods had shed their blood ages ago in creating humankind, it was wholly proper for people to offer their own blood to nourish the gods in the present. The high calling of the Aztec state was to supply this blood, largely through its wars of expansion and from prisoners of war, who were destined for sacrifice. The victims were “those who have died for the god.” The growth of the Aztec Empire therefore became the means for maintaining cosmic order and avoiding utter catastrophe. This ideology also shaped the techniques of Aztec warfare, which put a premium on capturing prisoners rather than on killing the enemy. As the empire grew, priests and rulers became mutually dependent, and “human sacrifices were carried out in the service of politics.”16 Massive sacrificial rituals, together with a display of great wealth, served to impress enemies, allies, and subjects alike with the immense power of the Aztecs and their gods.

Alongside these sacrificial rituals was a philosophical and poetic tradition of great beauty, much of which mused on the fragility and brevity of human life. Such an outlook characterized the work of Nezahualcoyotl (1402–1472), a poet and king of the city-state of Texcoco, which was part of the Aztec Empire:

Truly do we live on Earth?

Not forever on earth; only a little while here.

Although it be jade, it will be broken.

Although it be gold, it is crushed.

Although it be a quetzal feather, it is torn asunder.

Not forever on earth; only a little while here.17