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 High School
- Era 1: Three Worlds Meet (Beginnings to 1620)
- Era 2: Colonization and Settlement (1585-1763)
- Era 3: Revolution and the New Nation (1754-1820s)
- Era 4: Expansion and Reform (1801-1861)
- Era 5: Civil War and Reconstruction (1850-1877)
- Era 6: The Development of the Industrial United States (1870-1900)
- Era 7: The Emergence of Modern America (1890-1930)
- Era 8: The Great Depression and World War II (1929-1945)
- Era 9: Postwar United States (1945 to Early 1970s)
- Era 10: Contemporary United States (1968 to The Present)
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Middle School
- Era 1: Three Worlds Meet (Beginnings to 1620)
- Era 2: Colonization and Settlement (1585-1763)
- Era 3: Revolution and the New Nation (1754-1820s)
- Era 4: Expansion and Reform (1801-1861)
- Era 5: Civil War and Reconstruction (1850-1877)
- Era 6: The Development of the Industrial United States (1870-1900)
- Era 7: The Emergence of Modern America (1890-1930)
- Era 8: The Great Depression and World War II (1929-1945)
- Era 9: Postwar United States (1945 to Early 1970s)
- Era 10: Contemporary United States (1968 to The Present)
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Elementary School
- Living and Working Together in Families and Communities, Now and Long Ago
- The History of Students' Own State or Region
- The History of the United States: Democratic Principles and Values and the People from Many Cultures who Contributed to its Cultural, Economic, and Political Heritage
- The History of Peoples of Many Cultures Around the World
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