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The following historical eras were derived from the National Center for History in the Schools.
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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