Era
20th century
51
1900-1999
20
1939-1945
12
21st century
12
Civil War, 1994
9
1900 - 1999
5
Partition, 1947
5
1947-
4
2000-2099
4
1939 - 1945
3
1993-
3
2001
3
Since 1993
3
1800-1899
2
1897-1974
2
1913-1991
2
1919-2009
2
1956-
2
1979-
2
1985-
2
1994
2
1994-
2
19th century
2
2000 - 2099
2
2001-2010
2
20e siècle
2
711-1516
2
German occupation, 1940-1945
2
Since 1979
2
Warsaw Ghetto Uprising, 1943
2
1900-2099
1
1907-1931
1
1918-1960
1
1919-1947
1
1922-1995
1
1929-2004
1
1935-1998
1
1936-
1
1947
1
1952 - 1970
1
1952-1970
1
1953-
1
1965-
1
1967-
1
1968-2003
1
1980-2020
1
1980-2099
1
1992-
1
2001 - 2010
1
2002
1
more ...