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The Inca Civilization

In South America, the most highly developed and complex society was that of the Inca, whose name means "lord" or "ruler" in the Andean language called Quechua. At its height in the fifteenth and sixteenth centuries, the Inca Empire, located on the Pacific coast and straddling the Andes Mountains, extended some twenty-five hundred miles. It stretched from modern-day Colombia in the north to Chile in the south and included cities built at an altitude of 14,000 feet above sea level.
Its road system, kept free of debris and repaired by workers stationed at varying intervals, rivaled that of the Romans and efficiently connected the sprawling empire. The Inca, like all other pre-Columbian societies, did not use axle-mounted wheels for transportation. They built stepped roads to ascend and descend the steep slopes of the Andes; these would have been impractical for wheeled vehicles but worked well for pedestrians. These roads enabled the rapid movement of the highly trained Incan army.
Also, like the Romans, the Inca were effective administrators. Runners called chasquis traversed the roads in a continuous relay system, ensuring quick communication over long distances. The Inca had no system of writing, however. They communicated and kept records using a system of colored strings and knots called the quipu.
The Inca people worshipped their Lord who, as a member of an elite ruling class, had absolute authority over every aspect of life. Much like feudal lords in Europe at the time, the ruling class lived off the labor of the peasants, collecting vast wealth that accompanied them as they went, mummified, into the next life.
The Inca farmed corn, beans, squash, quinoa (a grain cultivated for its seeds), and the indigenous potato on terraced land they hacked from the steep mountains. Peasants received only one-third of their crops for themselves. The Inca ruler required a third, and a third was set aside in a kind of welfare system for those unable to work. Huge storehouses were filled with food for times of need.
Each peasant also worked for the Inca ruler a number of days per month on public works projects, a requirement known as the mita. For example, peasants constructed rope bridges made of grass to span the mountains above fast-flowing icy rivers. In return, the lord provided laws, protection, and relief in times of famine.
The Inca worshipped the sun god Inti and called gold the "sweat" of the sun. Unlike the Maya and the Aztecs, they rarely practiced human sacrifice and usually offered the gods food, clothing, and coca leaves. In times of dire emergency, however, such as in the aftermath of earthquakes, volcanoes, or crop failure, they resorted to sacrificing prisoners. The ultimate sacrifice was children, who were specially selected and well-fed. The Inca believed these children would immediately go to a much better afterlife.
In 1911, the American historian Hiram Bingham uncovered the lost Incan city of Machu Picchu. Located about fifty miles northwest of Cusco, Peru, at an altitude of about 8,000 feet, the city had been built in 1450 and inexplicably abandoned roughly a hundred years later. Scholars believe the city was used for religious ceremonial purposes and housed the priesthood.
The architectural beauty of this city is unrivaled. Using only the strength of human labor and no machines, the Inca constructed walls and buildings of polished stones, some weighing over fifty tons, that were fitted together perfectly without the use of mortar. In 1983, UNESCO designated the ruined city a World Heritage Site.