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Subject (Era)
- 20th century4,200
- 1861-18653,325
- 1775-17832,918
- 1945-19892,122
- 1933-19451,796
- 1989-1,603
- 21st century1,508
- 19th century1,431
- 2001-1,368
- 1857-18611,288
- 1945-1,205
- Civil War, 1861-18651,190
- 1815-18611,188
- Revolution, 1775-17831,169
- 1981-19891,105
- 1783-1865885
- 2001-2009868
- To 1775814
- 1969-1974743
- 1783-1809720