Era
20th century
80
19th century
66
2009-
44
To 1500
42
21st century
39
2001-2009
29
18th century
25
2003-
25
1946-
20
17th century
17
1991-
14
1988-
12
1989-
11
1900-1999
10
1945-
10
1948-
10
1964-
10
1980-
10
16th century
9
1723-1780
9
1867-
9
1960-
9
2009-2017
8
Civil War, 1861-1865
8
Colonial period, ca. 1600-1775
8
1800-1899
7
1809-1865
7
1944-
7
1947-
7
1954-
7
1965-
7
1997-
7
2000-
7
1775-1783
6
1783-1789
6
1800-1999
6
1809-1858
6
1918-1933
6
1924-2005
6
1950-
6
1951-
6
1966-
6
2002-
6
1755-1835
5
1841-1869
5
1907-1992
5
1918-1961
5
1952-
5
1955-
5
1956-
5
more ...