Era
19th century
4,602
20th century
3,763
Civil War, 1861-1865
815
Quaternary
508
18th century
467
To 1800
453
Revolution, 1775-1783
385
1939-1945
367
Early works to 1800
345
Cretaceous
343
From 2 million years ago
224
21st century
192
17th century
190
Paleozoic
171
Precambrian
171
1990
170
Nineteen tens
165
1918
163
1861-1865
158
1914-1918
154
1912
149
1917
147
Ottoman Empire, 1288-1918
141
Cenozoic
134
Tertiary
129
1890
127
1900
126
1889
123
16th century
118
1915
118
1873
116
1901
115
Jurassic
115
1905
114
1892
111
1854
109
1884
109
To 70 A.D
109
1909
107
1891
104
From 65 to 140 million years ago
102
1914
98
1945-
93
1850
92
1910
92
1897
90
1874
88
Ordovician
86
1908
84
1875
83
more ...