Era
19th century
5,019
20th century
4,153
Civil War, 1861-1865
1,002
18th century
782
Early works to 1800
688
Revolution, 1775-1783
592
Quaternary
497
To 1800
485
1939-1945
381
17th century
353
Colonial period, ca. 1600-1775
280
21st century
262
16th century
243
From 2 million years ago
239
1861-1865
220
Cretaceous
219
1800-1899
206
1990
192
Ottoman Empire, 1288-1918
178
1918
176
Precambrian
175
1914-1918
167
Nineteen tens
164
1912
160
1900-1999
159
1945-
154
1917
153
Paleozoic
141
1890
140
1900
139
1775-1783
129
1889
128
1915
128
1901
123
Cenozoic
123
1873
121
1892
119
To 70 A.D
119
1905
117
1854
113
1909
113
1891
110
Tertiary
106
1700-1799
104
1884
104
Qing dynasty, 1644-1912
104
1914
100
1910
99
1897
97
1850
95
more ...