Era
20th century
116
19th century
57
1945-
54
21st century
33
1918-1945
29
18th century
25
1990-
12
17th century
11
To 1865
11
Unification, 1990
11
1918-1933
7
1837-1901
6
1933-1945
5
1945-1990
5
1949-
5
British occupation, 1765-1947
5
1760-1860
4
1929
4
1960-
4
1989-
4
1991-
4
Elizabeth II, 1952-
4
Medieval period, 1066-1485
4
Medieval, 500-1500
4
16th century
3
1865-1918
3
1871-1918
3
1888-1918
3
1912-1949
3
1945-1989
3
1958-
3
1997-
3
2000-
3
Civil War, 1861-1865
3
To 1492
3
To 1868
3
1066-1485
2
1644-1912
2
1789-1900
2
1815-1861
2
1861-1917
2
1917-1945
2
1918-
2
1925-1953
2
1936-1945
2
1947-
2
1971-
2
1976-2000
2
1994-
2
2001-2009
2
more ...