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Subject (Era)
- 20th century58,600
- 19th century19,514
- 18th century5,905
- 21st century4,294
- 1900-19993,610
- 17th century2,345
- Civil War, 1861-18652,158
- 16th century1,656
- 1945-1,411
- 1933-19451,374
- Revolution, 1775-17831,036
- 1800-1899894
- Early modern, 1500-1700766
- Revolution, 1789-1799738
- 1945-1989716
- 1900 - 1999711
- Revolution, 1917-1921676
- 1918-1945646
- 1951-636
- 1991-619