CivilizationsOf North America By Manuel Alderete
** Over 9,000 years ago, corn plants were domesticated by ancient people in Mexico. ** This meant crops needed to be planted at certain times in order to be productive. ** This led to the first basic calendars for farming. ** Over 3,000 years ago , surplus food and calendar-keeping led to CIVILIZATION . The Spreading of Civilization in North America
Recommended Books Daily Life of the Aztecs By Jacques Soustelle Mexico: From the Olmecs to the Aztecs by Michael D. Coe The Maya by Michael D. Coe 1491: New Revelations on the Americas Before Columbus by Charles Mann
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