Era
1918-1945
57
1945-
46
1871-1918
40
20th century
39
1989-
31
19th century
20
17th century
15
1815-1871
15
21st century
13
Since 1989
12
1648-1715
11
Since 1945
11
1837-1901
10
1914-1940
10
1900-1999
9
1815-1848
8
1933-1945
8
1789-1815
7
1870-1940
7
18th century
7
1914-1945
7
1945-1953
7
1992-2010
7
2000-2099
7
1648-1789
6
1910-1936
6
1936-1945
6
1990-
6
Charles II, 1660-1685
6
1517-1648
5
1789-1900
5
1848-1871
5
1991-
5
1603-1714
4
1642-1660
4
1769-1821
4
1810-
4
1871-
4
1945-1989
4
1945-1990
4
Civil War, 1861-1865
4
Since 1991
4
1492-1648
3
1784-1865
3
1815-1898
3
1894-1917
3
1901-1910
3
1917-1945
3
1960-
3
Consulate and First Empire, 1799-1815
3
more ...