Era
20th century
472
21st century
204
19th century
45
1946-
42
1933-1945
38
1945-
30
1889-1945
27
Civil War, 1861-1865
21
1908-1973
18
1991-
18
18th century
17
1917-1963
17
1944-
17
1951-
17
1980-
17
1770-1827
16
1882-1945
16
1952-
16
1960-
16
1993-
16
1929-1968
14
1947-
14
1961-1970
14
1948-
13
2001-2009
13
17th century
12
1877-1964
12
1913-1994
12
1929
12
1934-
12
1941-
12
2000-
12
1900-1999
11
1939-
11
1942-
11
1955-
11
1961-1969
11
1988-
11
2003-
11
1918-1945
10
1926-
10
1935-
10
1958-
10
1966-
10
1979-
10
1990-
10
1809-1882
9
1936-
9
1964-
9
1975-
9
more ...