Era
21st century
215
20th century
187
1991-
168
2009-
145
2003-
130
2001-
87
2001-2009
74
Quaternary
61
1989-
46
1993-
42
1945-
39
1960-
38
1980-
37
1946-
35
1981-2001
35
1988-
33
19th century
33
1991-2003
31
Civil War, 1861-1865
31
Cretaceous
31
1997-
30
1990-
29
1951-
28
2000-
28
Civil War, 2011-
27
1952-
25
1957-
25
1986-
24
1964-
21
1965-
21
1992-
21
1948-
20
1959-
20
2002-
20
1979-
19
Tertiary
19
1956-
18
1966-
18
1971-
18
1981-
17
1949-
16
1954-
16
1979-1991
16
1985-
16
1963-
15
Revolution, 1775-1783
15
1809-1865
14
1934-
14
1961-
14
Holocene
14
more ...