Era
20th century
22
19th century
12
21st century
11
1991-2000
10
2001-2010
7
1981-1990
6
1564-1616
5
1961-1970
5
1874-1965
4
18th century
4
15th century
3
16th century
3
1944-
3
1959-1990
3
1969-
3
1977-
3
Civil War, 1861-1865
3
-30 B.C.
2
1133-1189
2
161-192
2
1651-1695
2
17th century
2
1802-1885
2
1843-1920
2
1892-1977
2
1895-1952
2
1900-2002
2
1905-1976
2
1908-1974
2
1921-2021
2
1926-2022
2
1930-2002
2
1939-
2
1939-1975
2
1942-
2
1946-
2
1947-
2
1949-
2
1951-1960
2
1954-
2
1958-
2
2001-2009
2
356 B.C.-323 B.C.
2
83 B.C.?-30 B.C.
2
Civil War, 1936-1939
2
Civil War, 1994
2
Elizabeth II, 1952-2022
2
Henry II, 1154-1189
2
Richard I, 1189-1199
2
-1305
1
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