Era
20th century
228
1900-1999
97
19th century
89
21st century
53
1800-1899
26
18th century
22
2000-2099
22
To 1500
13
1989-
11
1951-
9
1700-1799
8
17th century
8
1865-1950
7
2001-2009
7
1800-1999
6
1945-1989
6
Revolution, 1775-1783
6
1485-
5
16th century
5
1900-2099
5
1914-1940
5
1988-
5
476-1492
5
Since 1900
5
Since 1979
5
Since 1994
5
1837-1901
4
1901-1910
4
1917-1948
4
1933-1945
4
1946-
4
1964-
4
1968-1998
4
1979-
4
1993-2001
4
1994-
4
1997-
4
2002-
4
2008
4
Civil War, 1861-1865
4
Civil War, 1994
4
Colonial period, ca. 1600-1775
4
Renaissance, 1450-1600
4
1775-1865
3
1859-1947
3
1875-1955
3
1882-1965
3
1887-1940
3
1910-1921
3
1918-1933
3
more ...