Era
20th century
7
1789-1801
5
1783-1809
4
19th century
4
1918-1945
2
20e siècle
2
1800-1999
1
1863-1947
1
1865-1918
1
1872
1
1900-1999
1
1958-1987
1
1971-
1
1971-1990
1
1981-2001
1
1992
1
19e siècle
1
2000-
1
2009-
1
Case studies
1
Constitutional period, 1789-1809
1
Geschichte 1750-1995
1
Geschichte 1833
1
Geschichte 1900-1970
1
Geschichte 1970-1990
1
Mamagement-
1
Prognose 2020
1
Since 1971
1
Since 2009
1
To 1865
1
Unification, 1990
1