Era
20th century
60
1900-1999
36
1939-1945
35
19th century
23
1564-1616
11
1939 - 1945
11
1800-1899
10
1943-
9
1945-
9
18th century
8
1900 - 1999
8
2007
8
1775-1817
7
1800 - 1899
7
1930-
6
1939-1975
6
1957-
6
21st century
6
1812-1870
5
1924-1984
5
1969-
5
1977-
5
Civil War, 1861-1865
5
German occupation, 1940-1945
5
1700-1799
4
1850-1894
4
1856-1943
4
1927-2001
4
1928-1965
4
1928-2016
4
1935-
4
1946-
4
1947-
4
1949-
4
1964-
4
1968-
4
1971-
4
2006
4
Soviet occupation, 1979-1989
4
1491-1547
3
1507-1536
3
1789-1793
3
17th century
3
1821-1881
3
1847-1882
3
1857-1924
3
1860-1937
3
1866-1946
3
1879-1970
3
1885-1945
3
more ...