Era
1447-1492
1
1800-1899
1
1816-1855
3
1838-1865
1
1848-1870
1
1900-1999
2
1914-1918
1
1914-1945
1
1921-1987
2
1922-2000
1
1929
1
1934-1935
1
1939 - 1945
1
1939-1945
2
1945-1980
1
1953-
2
1961 - 1975
1
1967-
1
1969-
1
1975-1979
1
1979-
1
1988-
1
19th century
7
20th century
10
21st century
2
Casimir IV, 1447-1492
1
Civil War, 1861-1865
1
Colonial period, ca. 1600-1775
1
German occupation, 1940-1945
2
Japanese occupation, 1910-1945
1
Long March, 1934-1935
1
Occupation, 1939-1945
2