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Subject (Era)
- 20th century9
- 19th century4
- 20103
- Civil War, 1861-18653
- 1961-19752
- 2003-20112
- 1800-18991
- 18th century1
- 1900-19991
- 19291
- 1939-19451
- 1945-19551
- 19691
- 20111
- Athenian supremacy, 479-431 B.C.1
- From 140 to 190 million years ago1
- Japanese occupation, 1942-19451
- Jurassic1
- Persian Wars, 500-449 B.C.1
- Qin dynasty, 221-207 B.C.1