Era
20th century
20
1933-1945
7
1990-
6
19th century
5
1918-1933
4
1945-
3
1945-1990
3
21st century
3
Unification, 1990
3
1789-1900
2
1871-1918
2
1876-1967
2
1918-1945
2
1955-
2
1848-1849
1
1848-1918
1
1871-1933
1
1888 -1918
1
1901-
1
1914-1940
1
1917-1945
1
1929
1
1940-1944
1
1944-
1
1945-1955
1
1945-1989
1
1954-
1
1958-
1
1975-
1
1989-
1
1989-1990
1
2012
1
2012-
1
Civil War, 1936-1939
1
German occupation, 1940-1945
1
German occupation, 1941-1944
1