Era
20th century
29
19th century
25
1834-1902
7
1835-1910
7
18th century
5
1951-
5
1969-
5
21st century
4
1831-1904
3
1943-
3
1944-
3
1946-
3
1948-
3
1973-1993
3
1979-
3
-1792
2
1770-1838
2
1783-1859
2
1788-1824
2
1795-1821
2
1809-1882
2
1817-1862
2
1823-1890
2
1854-1900
2
1856-1939
2
1858-1919
2
1875-1961
2
1899-1961
2
1909-1955
2
1927-1989
2
1943-2021
2
1945-2020
2
1950-
2
1953-
2
1955-
2
1956-
2
1962-
2
1967-
2
1967-1993
2
1970-
2
1971-
2
1975-
2
1975-1990
2
Civil War, 1861-1865
2
Israeli intervention, 1982-1985
2
active 1776
2
-1400
1
-1932
1
1304-1377
1
1469-1524
1
more ...