Thinking About Chronology By pariharnandini Period: 4000 BCE to 1 CE Thinking About Chronology 3500 BCE Mesopotamia & Egypt Beginnings of Sumerian civilization and Egyptian Civilizations 3000 BCE The Americas North Chico civilizations 2200 BCE Indus Valley and Central Asia Beginnings of civilization in Indus Valley and Central Asia 2070 BCE China Beginnings of Chinese civilizations