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Subject (Era)
- 20th century9,364
- 1945-2,179
- 19th century2,127
- 21st century1,605
- 1900-19991,203
- 18th century1,039
- Civil War, 1861-1865598
- Civil War, 1642-1649559
- 1989-505
- 1960-427
- 1991-419
- 1945-1989412
- 1800-1899409
- 1918-408
- 2000-2099365
- 1975-331
- 1918-1945321
- Since 1945309
- Revolution, 1789-1799291
- Commonwealth and Protectorate, 1649-1660247