Era
20th century
185
21st century
101
Revolution, 1775-1783
75
1900-1999
61
2000-2099
45
19th century
37
1946-
28
1945-
18
1945-1989
14
1800-1899
13
1900-2099
13
1989-
13
2009-2017
13
1939-1945
12
2001-2009
11
Civil War, 1861-1865
11
1900 - 1999
10
1980-
10
1993-
9
Colonial period, ca. 1600-1775
9
2016
8
2009-
7
2017-
7
1809-1865
6
1933-1945
6
1942-
6
1951-
6
17th century
5
1861-1865
5
1909-2001
5
1913-1994
5
1948-
5
1949-
5
1964-
5
1967-
5
1969-1974
5
1970-
5
1981-
5
1993-2001
5
Since 1989
5
Since 2017
5
1800-1999
4
1908-1973
4
1917-1963
4
1939 - 1945
4
1941-
4
1955-
4
1963-1969
4
1971-
4
1974-1977
4
more ...