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Subject (Era)
- 20th century446,033
- 19th century187,204
- 21st century110,434
- 18th century83,035
- 17th century61,929
- 1945-38,260
- Civil War, 1861-186533,005
- 16th century27,866
- 1900-199926,782
- To 150020,371
- Revolution, 1775-178319,090
- Revolution, 1789-179918,390
- 2000-209915,207
- 1989-14,062
- Civil War, 1642-164913,769
- 1800-189913,264
- Colonial period, ca. 1600-177512,098
- 1918-194511,565
- 1933-194511,395
- 1991-11,231