Era
Civil War, 1861-1865
42
20th century
39
19th century
31
1945-
7
1933-1945
6
Revolution, 1775-1783
6
1796-1872
5
1918-1945
4
1935-1977
4
1970-2000
4
17th century
3
1809-1865
3
1865-1918
3
1929
3
1951-
3
1961-1970
3
-1400
2
1785-1851
2
1801-1917
2
1807-1870
2
1821-1882
2
1867-1910
2
1867-1960
2
1889-1945
2
1903-1975
2
1911-2006
2
1919-1933
2
1939-1945
2
1946-
2
1948-
2
1958-
2
1980-
2
2000-2020
2
Meiji period, 1868-1912
2
Revolution, 1789-1799
2
1200-1259
1
1526-1609
1
1564-1616
1
1564-1642
1
15th century
1
1606-1669
1
1613-1700
1
1684-1721
1
1697-1764
1
1743-1826
1
1743?-1803
1
1748-1825
1
1765-1947
1
1766-1813
1
1767-1845
1
more ...