Era
20th century
403
1900-1999
165
21st century
103
19th century
62
World War, 1939-1945
62
1939-1945
56
Civil War, 1861-1865
35
2000-2099
31
1800-1899
26
2003-2011
22
1945-
21
2003-
20
1989-
19
2001-2021
18
1945-1955
17
1948-
16
Since 1900
16
17th century
12
1960-
12
Civil War, 2011-
12
1800-1999
11
18th century
11
1945-1989
11
1900 - 1999
10
World War, 1914-1918
9
1900-2099
8
1914-1918
8
Civil War, 1642-1649
8
1933-1945
7
1974-
7
1991-
7
2001-
7
Since 1945
7
1980-
6
1988-
6
Appropriations and expenditures, 2019
6
Commonwealth and Protectorate, 1649-1660
6
Revolution, 1775-1783
6
1918-1945
5
1939 - 1945
5
1964-1985
5
1973-1988
5
1990-
5
1992-
5
1861-1865
4
1880-1964
4
1945-1991
4
1946-
4
1952-
4
1960
4
more ...