Era
20th century
83
19th century
29
21st century
16
18th century
12
1728-1779
6
17th century
6
1934-
5
1935-
5
1962-
4
To 1500
4
1785-1863
3
1786-1859
3
1874-1922
3
1926-
3
1942-
3
1945-
3
Civil War, 1861-1865
3
Ottoman Empire, 1288-1918
3
1469-1524
2
15th century
2
16th century
2
1786-1847
2
1821-1890
2
1858-1942
2
1868-1912
2
1874-1941
2
1888-1957
2
1893-1955
2
1914-
2
1917-2012
2
1919-1972
2
1927-
2
1938-
2
1938-1997
2
1939-
2
1941-
2
1946-
2
1949-
2
1950-
2
1951-
2
1960-
2
1961-
2
1963-
2
1964-
2
1968-
2
1971-
2
1978-
2
1981-
2
1983-
2
1988-
2
more ...