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 :'''4. - THE ANAHUAC HUMAN DEVELOPMENT PYRAMD.'''

During the Preclassical period, comprising since the agriculture invention approximately from the year 6000 BCE, up to 200 CE, flourished the most important bases of human development in the Anahuac.

Indeed, since the time ancient Mexicans ceased to be: nomads, hunters and gatherers, thanks to the agriculture invention, up to the point they had the basis to start their development fullness, approximately five thousand eight hundred years went by. It was during this long training period that the Toltecáyotl is born, the knowledge structures are created, systematized in the four systems that make up the development pyramid.

The Food System, that goes from plant domestication, corn invention, hydraulic engineering, animals domestication, the profound knowledge of different plant species, animals, insects and minerals, up to creating an immeasurable cuisine culture, with a high nutritional level. This prodigy became diversified throughout the Anáhuac, involving different and varied ecological niches. Producing energy and free time to perform their elevated social purposes.