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Subject (Era)
- 20th century537
- 1945-1989314
- 1989-262
- 19th century173
- 1775-1865164
- 1951-147
- War of 1812140
- 21st century137
- 1945-133
- 1865-1950115
- 2001-92
- 1981-198984
- 1933-194578
- 1815-186177
- 1993-66
- Revolution, 1775-178366
- Civil War, 1861-186565
- 2001-200964
- 1993-200162
- 1789-179761