Era
20th century
9,004
1945-
3,906
21st century
2,713
1900-1999
1,731
19th century
1,699
Since 1945
1,254
1900 - 1999
1,170
1991-
860
2000-2099
841
1960-
697
Civil War, 1861-1865
691
18th century
680
1918-
676
1918-1945
570
1945-1989
564
1989-
561
1990-
407
1939-1945
334
Since 1991
310
2000-
307
1800-1899
302
1979-
297
1947-
285
2000 - 2099
275
1975-
274
1980-
271
1933-1945
243
1976-
236
Revolution, 1789-1799
234
Since 1960
223
1976-2000
218
1951-
215
1948-
208
1982-
206
Since 1918
204
1970-
194
Colonial period, ca. 1600-1775
187
1994-
186
17th century
183
1981-
181
1949-
174
1985-
171
1900-2099
166
Since 1989
166
1914-1918
164
1564-1616
162
1993-
160
1974-
153
1971-1990
148
Revolution, 1775-1783
146
more ...