Era
20th century
15
1900-1999
12
1939-1945
10
1945-1976
10
1916-1978
6
1922-1975
6
1945-
6
1976-1994
6
Since 1945
6
19th century
5
1914-1945
4
1917-1936
4
Civil War, 1861-1865
4
Revolution, 1917-1921
4
1705-1782
3
1740-1814
3
1821-1881
3
1828-1910
3
1884-1942
3
1918-1945
3
Revolution, 1910-1920
3
-453
2
1182-1226
2
1564-1616
2
1789-1900
2
17th century
2
1800-1899
2
1849-1870
2
1861-1865
2
1866-
2
18th century
2
1900 - 1999
2
1902-1975
2
1904-1973
2
1916-2000
2
1927-2018
2
1945 - 1976
2
1945-1980
2
1950-
2
1952-
2
1966-
2
German occupation, 1943-1945
2
Since 1849
2
-1400
1
1313-1375
1
1389-1464
1
1404-1472
1
1517-1871
1
1562-1635
1
1599-1667
1
more ...