History of agriculture
Wild grains were collected and eaten from at least 20,000 BC. From around 9500 BC, the eight Neolithic founder crops – emmer wheat, einkorn wheat, hulled barley, peas, lentils, bitter vetch, chick peas, and flax – were cultivated in the Levant. Rye may have been cultivated earlier but this remains controversial. Rice was domesticated in China by 6200 BC with earliest known cultivation from 5700 BC, followed by mung, soy and azuki beans. Pigs were domesticated in Mesopotamia around 11,000 BC, followed by sheep between 11,000 BC and 9000 BC. Cattle were domesticated from the wild aurochs in the areas of modern Turkey and Pakistan around 8500 BC. Sugarcane and some root vegetables were domesticated in New Guinea around 7000 BC. Sorghum was domesticated in the Sahel region of Africa by 5000 BC. In the Andes of South America, the potato was domesticated between 8000 BC and 5000 BC, along with beans, coca, llamas, alpacas, and guinea pigs. Bananas were cultivated and hybridized in the same period in Papua New Guinea. In Mesoamerica, wild teosinte was domesticated to maize by 4000 BC. Cotton was domesticated in Peru by 3600 BC. Camels were domesticated late, perhaps around 3000 BC.
History of the world
The Neolithic Revolution, beginning around 10,000 BCE, saw the development of agriculture, which fundamentally changed the human lifestyle. Farming developed around 10,000 BCE in the Middle East, around 7000 BCE in what is now China, about 6000 BCE in the Indus Valley and Europe, and about 4000 BCE in the Americas. Cultivation of cereal crops and the domestication of animals occurred around 8500 BCE in the Middle East, where wheat and barley were the first crops and sheep and goats were domesticated. In the Indus Valley, crops were cultivated by 6000 BCE, along with domesticated cattle. The Yellow River valley in China cultivated millet and other cereal crops by about 7000 BCE, but the Yangtze River valley domesticated rice earlier, by at least 8000 BCE. In the Americas, sunflowers were cultivated by about 4000 BCE, and corn and beans were domesticated in Central America by 3500 BCE. Potatoes were first cultivated in the Andes Mountains of South America, where the llama was also domesticated. Metal-working, starting with copper around 6000 BCE, was first used for tools and ornaments. Gold soon followed, with its main use being for ornaments. The need for metal ores stimulated trade, as many of the areas of early human settlement were lacking in ores. Bronze, an alloy of copper and tin, is first known from about 2500 BCE, but did not become widely used until much later.
Though early "cities" appeared at Jericho and Catal Huyuk around 6000 BCE, the first civilizations did not emerge until around 3000 BCE in Egypt and Mesopotamia. These cultures gave birth to the invention of the wheel, mathematics, bronze-working, sailing boats, the pottery wheel, woven cloth, construction of monumental buildings, and writing. Writing developed independently and at different times in five areas of the world: Egypt (c. 3200 BCE), India (c. 3200 BCE), Mesopotamia (c. 3000 BCE), China (c. 1600 BCE), and Mesoamerica (c. 600 BCE).