Era
20th century
126
21st century
30
19th century
29
1929
18
Civil War, 1861-1865
17
Colonial period, ca. 1600-1775
10
1867-1957
8
Revolution, 1775-1783
8
2008
6
1933-1945
5
1902-1967
4
1986
4
1988
4
1775-1865
3
1822-1913
3
1832-1888
3
1853-1890
3
1882-1956
3
1898-1951
3
18th century
3
1917-2000
3
1929-1968
3
1968
3
1993
3
2000
3
2002
3
2005
3
2009
3
2011
3
German occupation, 1940-1945
3
Heian period, 794-1185
3
-1400
2
-1423
2
1485-1547
2
1564-1616
2
1774-1845
2
1797-1851
2
1799-1847
2
1815 or 1816-
2
1877-1964
2
1883-1963
2
1885-1976
2
1886-1957
2
1894-1962
2
1899-1985
2
1912-1950
2
1929-1945
2
1930-1961
2
1943
2
1945-1955
2
more ...