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Period: 5000 BCE to 3500 BCE
Ancient Mesopotamia
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4000 BCE
Sumers establish large ziggurats located at the center of their cities as religious temples
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3500 BCE
Lower Mesopotamia starts to become inhabited by Sumerians
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Period: 800 BCE to 500 BCE
Ancient Greece
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776 BCE
First Olympic Games
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399 BCE
The philosopher Socrates is condemned to death for extensively questioning his own society