Era
20th century
22
1989-
21
21st century
21
1945-1989
17
2001-2009
10
19th century
8
1951-
7
2009-2017
5
18th century
4
1945-
4
1980-
4
2000-2099
4
2017-
4
1946-
3
1775-1783
2
1865-1933
2
1910-1946
2
1960-
2
1981-1989
2
1991-
2
2016
2
Revolution, 1910-1920
2
To 146 B.C.
2
To 1500
2
To 1865
2
1421-1737
1
1485-
1
1660-1688
1
1725-1792
1
1789-1799
1
1789-1820
1
17th century
1
1824-1920
1
1832-1886
1
1841-1845
1
1845-1861
1
1861-1865
1
1865-1900
1
1865-1950
1
1870-1924
1
1878-1967
1
1898-1952
1
1900-2099
1
1909-1933
1
1910-1943
1
1917-1936
1
1929-1981
1
1933-1959
1
1935-
1
1939-1975
1
more ...