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Subject (Era)
- 20th century566
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- 1989-267
- 19th century178
- 1775-1865164
- 1951-148
- 21st century146
- 1945-141
- War of 1812140
- 1865-1950115
- 2001-96
- 1981-198986
- 1933-194580
- 1815-186179
- Revolution, 1775-178372
- 1993-71
- 2001-200969
- Civil War, 1861-186565
- 1993-200163
- 1789-179761