Era
20th century
26
1945-
11
21st century
8
1945-1989
7
19th century
5
Civil War, 1861-1865
5
1971-1981
4
1812-1870
3
1564-1616
2
1822-1888
2
1918-1945
2
1961-1971
2
1981-2001
2
1989-
2
2003-
2
1608-1674
1
1783-1865
1
1803-1882
1
1880-1956
1
1926-1945
1
1933-1945
1
1945-1991
1
1970-
1
1976-
1
1976-2002
1
1979-
1
1981-1989
1
1981-1993
1
1989-1993
1
1991-
1
1993-2001
1
2002-
1
Early church, ca. 30-600
1
Precambrian
1
Primitive and early church, ca. 30-600
1
Quaternary
1
Siglo XX
1
Victoria, 1837-1901
1