Era
20th century
54
1945-
10
19th century
9
1933-1945
8
1918-1933
7
1990-
7
21st century
5
1918-1945
4
1945-1989
4
1945-1990
3
Unification, 1990
3
1890-1970
2
1914-1940
2
1958-1969
2
1989-
2
1991-
2
1789-1900
1
1848-1849
1
1848-1870
1
1848-1918
1
1870-1914
1
1871-
1
1871-1918
1
1871-1933
1
1876-1967
1
1889-1966
1
1906-2002
1
1913-1992
1
1914-1945
1
1917-1945
1
1922-1945
1
1929
1
1940-1944
1
1944-
1
1955-
1
1958-
1
1973-
1
1989-1990
1
1991-2003
1
1994-
1
German occupation, 1940-1945
1
German occupation, 1941-1944
1