In the Pre-classic period (1800 B.C. to A.D. 250), permanent village life grew and lead to the early Maya cities. The early Maya cities were carefully planned. Nixtun-Ch'ich, in Peten, Guatemala, had pyramids, temples and other structures that were built using a grid system.
Farming became more effective during this period, likely because of the discovery of the "nixtamal" process, where maize is soaked in lime or something similar and cooked to increase the nutritional value. Other crops included squash, bean, chilli pepper and manioc.
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