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Subject (Era)
- Civil War, 1861-18659,352
- Revolution, 1775-17833,814
- 1861-18652,710
- 20th century2,226
- 19th century1,545
- Colonial period, ca. 1600-17751,199
- War of 18121,121
- 1775-17831,051
- 21st century612
- 1857-1861547
- 1918-1945539
- 1945-537
- 1783-1865513
- 1815-1861459
- 1971-1981424
- 1900-1999417
- To 1775402
- 1981-2001357
- 1800-1899334
- 18th century325