Agrarian society
Agrarian society were preceded by hunter and gatherer and horticultural societies and transition into industrial society. The transition to agriculture, called the Neolithic Revolution, has taken place independently multiple times. Horticulture and agriculture as types of subsistence developed among humans somewhere between 10,000 and 8,000 years ago in the Fertile Crescent region of the Middle East. The reasons for the development of agriculture are debated but may have included climate change, and the accumulation of food surplus for competitive gift-giving. Most certainly there was a gradual transition from hunter-gatherer to agricultural economies after a lengthy period when some crops were deliberately planted and other foods were gathered from the wild. In addition to the emergence of farming in the Fertile Crescent, agriculture appeared in: by at least 6,800 B.C.E. in East Asia (rice) and, later, in Central and South America (maize and squash). Small-scale agriculture also likely arose independently in early Neolithic contexts in India (rice) and Southeast Asia (taro). However, full dependency on domestic crops and animals, when wild resources contributed a nutritionally insignificant component to the diet, did not occur until the Bronze Age.
Agriculture in the prehistoric Southwest
Southwestern farmers probably began experimenting with agriculture by facilitating the growth of wild grains such as Amaranth and chenopods and gourds for edible seeds and containers. The earliest maize known to have been grown in the Southwest was a popcorn variety with a cob only about one or two inches long. It was not a very productive crop. More productive varieties were developed by Southwestern farmers or introduced from Mesoamerica. Beans and squash were also introduced from Mesoamerica, although the drought-resistant Tepary bean was native. Cotton, presumably cultivated, is found at archaeological sites dating about 1200 BC in the Tucson basin and evidence of tobacco use, and possibly cultivation, occurs at about the same time. Agave, especially Agave murpheyi, was a major food source of the Hohokam and was grown on dry hillsides where other crops would not grow. The early farmers also consumed and possibly facilitated the growth of cactus fruit, mesquite bean, and species of wild grasses for their edible seeds.