Era
Civil War, 1861-1865
63
To 1800
58
Revolution, 1775-1783
33
20th century
12
Geschichte
7
To 1900
7
1939-1945
6
Colonial period, ca. 1600-1775
5
Quaternary
5
1775-1783
4
1789-1815
4
1861-1865
4
19th century
4
1769-1821
3
1775-1783 (Révolution)
3
18th century
3
From 2 million years ago
3
Medieval, 500-1500
3
Mesozoic
3
1066-1485
2
1492-1792
2
1970
2
2000-
2
2002-
2
21st century
2
French and Indian War, 1755-1763
2
Paleozoic
2
1440-1501
1
1512-1594
1
1596-1673
1
15th century
1
16th century
1
1728-1779
1
1749
1
17th century
1
1800-1899
1
1824-1886, USMA 1844
1
1861-1865 (Guerre de Sécession)
1
1861-1953
1
1862-1865
1
1865-
1
1865-1877
1
1866-1895
1
1867-1957
1
1871-1918
1
1889-1951
1
1892-1973
1
1917-1948
1
1943
1
1945-
1
more ...