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Subject (Era)
- 19th century1,834
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- 17th century383
- To 1500283
- 16th century268
- Revolution, 1789-1799264
- Colonial period, ca. 1600-1775232
- Middle Ages, 600-1500212
- Civil War, 1642-1649186
- 1803-1966134
- Charles I, 1625-1649124
- Qing dynasty, 1644-1912122
- 1900-1999121
- Revolution, 1917-1921116
- 1933-1945113
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- 1918-1945104
- Civil War, 1861-1865102
- To 177593