Era
20th century
175
19th century
68
21st century
50
1981-2001
31
2009-
31
1945-
23
2001-2009
17
1989-
12
2000-
12
18th century
10
1970-
10
1960-
8
1981-1993
8
1929
7
1933-1945
6
1955-
6
16th century
5
1856-1915
5
1865-1918
5
1901-1953
5
1945-1989
5
1946-
5
1955-2011
5
1993-2001
5
17th century
4
1918-
4
1918-1945
4
1935-2020
4
1945-1964
4
1976-
4
1991-
4
Civil War, 1861-1865
4
To 1500
4
1760-1860
3
1835-1919
3
1863-1947
3
1918-1933
3
1969-
3
1971-
3
1980-
3
2003-
3
1644-1912
2
1789-1900
2
1847-1931
2
1857-1945
2
1858-1919
2
1858-1942
2
1865-1898
2
1869-1928
2
1879-1915
2
more ...