Era
20th century
590
1933-1945
230
1918-1933
158
19th century
85
Unification, 1990
85
1945-1990
66
1990-
55
1871-1918
46
1945-
42
1945-1955
34
1789-1900
30
1889-1945
28
1918-1945
24
1871-
18
Allied occupation, 1945-
17
1888-1918
15
18th century
13
William II, 1888-1918
12
1989-1990
11
Revolution, 1918
10
1859-1941
9
21st century
9
1848-1870
8
1866-1871
8
World War, 1939-1945
7
1800-1933
6
1881-1960
6
1939-1945
5
Allied occupation, 1918-1930
5
History
5
1989-
4
843-1273
4
German occupation, 1941-1944
4
1273-1517
3
17th century
3
1815-1866
3
1815-1870
3
1864-1920
3
1878-1957
3
1883-1969
3
1893-1959
3
1897-1945
3
1922-1945
3
1945-1953
3
1982-1990
3
Blockade, 1948-1949
3
Bombardment, 1940-1945
3
1517-1871
2
16th century
2
1740-1815
2
more ...