The Eastern Agricultural Complex in the woodlands of eastern North America was one of about 10 independent centers of plant domestication in the pre-historic world. Incipient agriculture dates back to about 5300 BCE. By about 1800 BCE the Native Americans of the woodlands were cultivating several species of food plants, thus beginning a transition from a hunter-gatherer economy to agriculture. After 200 BCE when maize from Mexico was introduced to the Eastern Woodlands, the Native Americans of the eastern United States and adjacent Canada slowly changed from growing local indigenous plants to a maize-based agricultural economy. The cultivation of local indigenous plants other than squash and sunflower declined and was eventually abandoned. The formerly domesticated plants returned to their wild forms.[1]
The first four plants known to have been domesticated at the Riverton Site in Illinois in 1800 BCE were goosefoot (Chenopodium berlandieri), sunflower (Helianthus annuus var. macrocarpus), marsh elder (Iva annua var. macrocarpa), and squash (Cucurbita pepo ssp. ovifera). Several other species of plants were later domesticated.[2]
- ^ Smith, Bruce D.; Yarnell, Richard A. (2009). "Initial formation of an indigenous crop complex in eastern North America". Proceedings of the National Academy of Sciences. 106 (16). National Academy of Sciences of the United States of America: 6561–6566. doi:10.1073/pnas.0901846106. JSTOR 40482136. PMC 2666091. PMID 19366669.
- ^ Smith and Yarnell, p. 6561