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Subject (Era)
- 21st century8,958
- 20th century6,145
- 18th century5,896
- Revolution, 1789-17995,357
- 19th century5,131
- 17th century2,244
- Civil War, 1642-16491,522
- Colonial period, ca. 1600-17751,402
- 16th century1,159
- To 1500883
- Charles I, 1625-1649731
- Revolution, 1775-1783633
- 1933-1945514
- 1789-1815476
- Middle Ages, 600-1500464
- 1900-1999462
- To 1775421
- Qing dynasty, 1644-1912410
- Revolution, 1917-1921408
- Civil War, 1861-1865407