Era
20th century
130
19th century
35
1933-1945
17
21st century
13
1945-
11
1989-
8
1990-
7
17th century
6
18th century
6
1945-1990
5
1960-
4
1980-
4
16th century
3
1789-1900
3
1789-1945
3
1801-1917
3
1945-1992
3
Civil War, 1994
3
German occupation, 1941-1944
3
1800-1933
2
1889-1945
2
1912-
2
1918-
2
1918-1938
2
1918-1945
2
1921-
2
1937-1945
2
1985-1991
2
1991-
2
1994-
2
German occupation, 1940-1945
2
Unification, 1990
2
Victoria, 1837-1901
2
Warsaw Ghetto Uprising, 1943
2
(1939-1945)
1
1534-1921
1
1603-1714
1
1644-1912
1
1689-1801
1
1711-1799
1
1777-1918
1
1789-
1
1800-1950
1
1815-1848
1
1830-1916
1
1840-1902
1
1848-1918
1
1849-1928
1
1859-1935
1
1861-1912
1
more ...