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Subject (Era)
- 20th century9,422
- 19th century4,544
- 21st century2,241
- 18th century2,163
- 17th century1,383
- Civil War, 1861-18651,089
- 1945-779
- Civil War, 1642-1649760
- Revolution, 1789-1799742
- 16th century619
- Revolution, 1775-1783611
- 1900-1999586
- To 1500400
- Revolution, 1917-1921396
- 1800-1899347
- Colonial period, ca. 1600-1775336
- 1918-1945326
- Ottoman Empire, 1288-1918320
- 1989-309
- Early church, ca. 30-600308