In the highlands of the central Andes, over the course of barely a century, a civilization constructed what became the largest empire in the pre-Columbian Americas — an achievement made all the more remarkable by the fact that it was accomplished without the wheel, without draft animals capable of heavy burden, without iron or steel, and without a conventional writing system. The Inca Empire, known in the Quechua language as Tawantinsuyu, meaning the land of the four parts, grew from the Peruvian highlands sometime in the early thirteenth century and at its height united an expanse of western South America encompassing what are today Peru, western Ecuador, western and south-central Bolivia, northwest Argentina, the southwesternmost tip of Colombia, and a large portion of Chile.
The name Tawantinsuyu reflected the empire's fundamental administrative structure. The capital at Cusco sat at the intersection of four great regions, or suyu: Chinchaysuyu to the north, Antisuyu to the east toward the Amazon jungle, Qullasuyu to the south, and Kuntisuyu to the west. This four-part division was not merely ceremonial — it organized the empire's administration, its census-taking, its labor obligations, and its military mobilizations. The Inca rulers, known as the Sapa Inca, were regarded not as ordinary monarchs but as divine figures, specifically as sons of Inti, the sun god, whose worship the Inca leadership imposed as the empire's paramount religion above the many local sacred traditions that persisted in conquered territories.
From 1438 to 1533, the Incas incorporated territory at a pace and scale that astonished their contemporaries and has continued to astonish historians. The expansion was accomplished through a sophisticated combination of military conquest and what might be called diplomatic absorption: local rulers who submitted peacefully were often allowed to continue governing their communities, their children taken to Cusco to be educated and assimilated into Inca culture. Those who resisted faced military force followed by more thorough administrative reorganization. The anthropologist Gordon McEwan has described the result as one of the greatest imperial states in human history, built without many of the material technologies that other great empires considered essential.
The infrastructure the Incas created to hold this enormous state together was extraordinary. The Qhapaq Nan, the royal road network, stretched for tens of thousands of miles through some of the most challenging terrain on earth — over the high Andes, through coastal deserts, into tropical forests. Relay runners called chasquis carried messages and small goods along this network with remarkable speed, allowing the Sapa Inca in Cusco to receive information from distant corners of the empire in days rather than weeks. Storehouses called qollqas were maintained at regular intervals along the roads and in strategic locations throughout the empire, stocked with food, weapons, textiles, and other necessities for armies on the move and workers on state projects.
The absence of a conventional writing system was addressed through the quipu, or khipu — a complex system of knotted strings in which the position, color, and type of knots encoded numerical and possibly narrative information. Quipus were used for record-keeping, census data, tax accounts, and communication, maintained and interpreted by specialists called quipucamayocs. Thousands of quipus survive in museums around the world, though the full range of information they encoded remains only partially deciphered by modern researchers.
The Inca economy operated on principles fundamentally different from those of market economies. There was effectively no currency, no marketplace in the conventional sense. The entire system was built on reciprocity and redistribution. The state demanded labor from its subjects — a tax paid in work rather than goods — through a system called mit'a. In return, the state provided workers with food, clothing, tools, and other necessities during their period of service, and periodically hosted great celebratory feasts for the population. The Sapa Inca theoretically owned all means of production, and access to land and resources flowed downward from this divine sovereign. The nobility — the ethnic Incas, probably numbering only between fifteen thousand and forty thousand people — administered this enormous system over a subject population of roughly ten million.
Inca architecture, particularly its stonework, remains among the most impressive in human history. Without metal tools, the Incas dressed massive stones to fit together with extraordinary precision, requiring no mortar, in buildings that have survived centuries of seismic activity. Machu Picchu, the mountaintop complex constructed above the Urubamba Valley, is only the most famous of thousands of Inca sites that still mark the Andean landscape.
The first European to reach the empire was the Portuguese explorer Aleixo Garcia in 1524. But the encounter that ended the Inca world came in 1532, when the Spanish conquistador Francisco Pizarro led a small force into the Inca heartland. Pizarro found an empire already weakened by a devastating smallpox epidemic — a disease introduced by European contact before the Spanish themselves had arrived — and torn by a civil war between two rival claimants to the throne, Atahualpa and Huascar. Exploiting these vulnerabilities with ruthless opportunism, Pizarro ambushed and captured Atahualpa at the city of Cajamarca. Despite a famous ransom of an enormous room filled with gold and silver, Atahualpa was executed in 1533. The conquest proceeded over the following decades, and by 1572, the last Inca state, a resistance holdout in the jungle province of Vilcabamba, was finally extinguished. The empire of Tawantinsuyu, which had risen to greatness in less than a century, had been destroyed in barely four decades. Its road network, its agricultural terracing, and its architectural monuments survive as testimony to what had been built.
