Era
1918-1945
16
1945-
12
20th century
12
19th century
7
1871-1918
6
1900-1945
3
1919-1932
3
1945-1955
3
1989-
3
Since 1945
3
To 221 B.C.
3
Unification, 1990
3
1815-1871
2
1848-1871
2
1874-1965
2
1900-1918
2
1933-1945
2
1945-1989
2
1955-1965
2
Since 1989
2
1648-1715
1
1769-1821
1
1789-1815
1
1789-1899
1
1789-1900
1
1844-1900
1
1890-1969
1
1900-1999
1
1917-1945
1
1918-1960
1
1945-1979
1
1953-1961
1
21st century
1
To 1900
1