Era
20th century
500
19th century
249
21st century
137
18th century
89
1945-
59
1989-
51
17th century
49
16th century
36
To 1500
36
1991-
29
Quaternary
28
1945-1989
24
1933-1945
22
2000-
22
Precambrian
21
Cretaceous
19
Early modern, 1500-1700
17
1564-1616
16
1976-2000
16
1889-1951
15
1949-
14
Civil War, 1861-1865
14
1960-
13
1724-1804
12
Eocene
12
Middle Ages, 600-1500
12
Tertiary
12
1844-1900
11
1990-
11
1856-1939
10
1976-
10
1993-
10
1770-1831
9
1882-1941
9
1929
9
1975-
9
Primitive and early church, ca. 30-600
9
1839-1914
8
1889-1976
8
1925-1995
8
1947-
8
Early church, ca. 30-600
8
Holocene
8
Pleistocene
8
1979-
7
1980-2020
7
Colonial period, ca. 1600-1775
7
1789-1900
6
1885-1962
6
1926-1984
6
more ...