Although some indigenous peoples of the Americas were traditionally hunter-gatherers—and many, especially in the Amazon basin, still are—many groups practiced aquaculture and agriculture. The impact of their agricultural endowment to the world is a testament to their time and work in reshaping and cultivating the flora indigenous to the Americas. Although some societies depended heavily on agriculture, others practiced a mix of farming, hunting and gathering. In some regions the indigenous peoples created monumental architecture, large-scale organized cities, city-states, chiefdoms, states, kingdoms and empires. Among these are the Aztec, Inca and Maya states that until the 16th century were among the most politically and socially advanced nations in the world. They had a vast knowledge of engineering, architecture, mathematics, astronomy, writing, physics, medicine, planting and irrigation, geology, mining, sculpture and goldsmithing.
Since the 19th century, the prevailing scholarly consensus has been that the mounds were constructed by indigenous peoples of the Americas. Sixteenth-century Spanish explorers made contact with natives living in a number of later Mississippian cities, described their cultures, and left artifacts. By the time of United States westward expansion two hundred years later, Native Americans were generally not knowledgeable about the civilizations that produced the mounds. Research and study of these cultures and peoples has been based mostly on archaeology and anthropology.
Andénes in the Sacred Valley of the Incas, Peru. Many of the Incas' descendants, Quechua-speaking Andean farmers, continue to use the Incan agricultural terraces.
Indigenous people at a Brazilian farm plantation in Minas Gerais ca. 1824
Chimu culture feather pectoral, feathers, reed, copper, silver, hide, cordage, ca. 1350–1450 CE
Drawing accompanying text in Book XII of the 16th-century Florentine Codex (compiled 1540–1585), showing Nahuas of conquest-era central Mexico suffering from smallpox
Sequoyah (ᏍᏏᏉᏯ Ssiquoya, as he signed his name, or ᏎᏉᏯ Se-quo-ya, as his name is often spelled today in Cherokee) (c. 1770–1840), named in English George Gist or George Guess, was a Cherokeesilversmith. In 1821 he completed his independent creation of a Cherokee syllabary, making reading and writing in Cherokee possible. This was the only time in recorded history that a member of a pre-literate people independently created an effective writing system. After seeing its worth, the people of the Cherokee Nation rapidly began to use his syllabary and officially adopted it in 1825. Their literacy rate quickly surpassed that of surrounding European-American settlers.