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Period: 7000 BCE to 9000 BCE
Domestication of Teosinte into Corn
Before the Mesoamerican civilizations even began, people started turning wild teosinte into
maize, which became a very important crop. -
3500 BCE
Rise of Mesopotamian Civilization
The first cities and writing systems appeared in southern Mesopotamia (modern-day Iraq)
with the Sumerians. -
2500 BCE
Start of the Preclassic Period (Olmec Civilization in Mesoamerica)
In Mesoamerica, early complex societies began to form, setting the stage for later cultures.