Era
20th century
16
19th century
7
18th century
4
1945-
3
1917-1936
2
17th century
1
1865-1918
1
1904-2005
1
1912-1949
1
1918-1945
1
1933-1945
1
1935-
1
1943-
1
1945-1989
1
1946-
1
1949-
1
21st century
1
Meiji period, 1868-1912
1
Revolution, 1789-1799
1
Revolution, 1917-1921
1
Russian intervention, 1968-
1
Unification, 1990
1
b. 1681
1