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 High School
- Era 1: The Beginnings of Human Society
- Era 2: Early Civilizations and the Emergence of Pastoral Peoples, 4000-1000 BCE
- Era 3: Classical Traditions, Major Religions, and Giant Empires, 1000 BCE -300 BCE
- Era 4: Expanding Zones of Exchange and Encounter, 300-1000 CE
- Era 5: Intensified Hemispheric Interactions, 1000-1500 CE
- Era 6: The Emergence of the First Global Age, 1450-1770
- Era 7: An Age of Revolutions, 1750-1914
- Era 8: A Half-Century of Crisis and Achievement, 1900-1945
- Era 9: The 20th Century Since 1945: Promises And Paradoxes
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Middle School
- Era 1: The Beginnings of Human Society
- Era 2: Early Civilizations and the Emergence of Pastoral Peoples, 4000-1000 BCE
- Era 3: Classical Traditions, Major Religions, and Giant Empires, 1000 BCE -300 BCE
- Era 4: Expanding Zones of Exchange and Encounter, 300-1000 CE
- Era 5: Intensified Hemispheric Interactions, 1000-1500 CE
- Era 6: The Emergence of the First Global Age, 1450-1770
- Era 7: An Age of Revolutions, 1750-1914
- Era 8: A Half-Century of Crisis and Achievement, 1900-1945
- Era 9: The 20th Century Since 1945: Promises And Paradoxes
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Elementary School
- Era 1: The Beginnings of Human Society
- Era 2: Early Civilizations and the Emergence of Pastoral Peoples, 4000-1000 BCE
- Era 3: Classical Traditions, Major Religions, and Giant Empires, 1000 BCE -300 BCE
- Era 4: Expanding Zones of Exchange and Encounter, 300-1000 CE
- Era 5: Intensified Hemispheric Interactions, 1000-1500 CE
- Era 6: The Emergence of the First Global Age, 1450-1770
- Era 7: An Age of Revolutions, 1750-1914
- Era 8: A Half-Century of Crisis and Achievement, 1900-1945
- Era 9: The 20th Century Since 1945: Promises And Paradoxes
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