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AP United States History
Nine chronological periods from 1491 to the present with an interactive era timeline and DBQ trainer.
Unit 1 · 4–6%
Period 1: 1491–1607
Unit 2 · 6–8%
Period 2: 1607–1754
Unit 3 · 10–17%
Period 3: 1754–1800
Unit 4 · 10–17%
Period 4: 1800–1848
Unit 5 · 10–17%
Period 5: 1844–1877
Unit 6 · 10–17%
Period 6: 1865–1898
Unit 7 · 10–17%
Period 7: 1890–1945
Unit 8 · 10–17%