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Subject (Era)
- 20th century1,544
- 19th century780
- Civil War, 1861-1865459
- 18th century363
- Revolution, 1775-1783339
- Revolution, 1789-1799336
- 21st century278
- 1861-1865166
- Civil War, 1936-1939152
- 17th century132
- 1933-1945122
- 1900-1999111
- 16th century88
- Revolution, 1917-192155
- 1945-53
- 1945-198951
- To 150051
- Unification, 199048
- 1789-182043
- 1760-178935