Era
21st century
42
1981-2001
20
20th century
16
1945-
8
2001-2009
6
1990-
4
1960-
3
1965-
3
1971-1981
3
19th century
3
2000-
3
2009-
3
World War, 1939-1945
3
1918-1945
2
1971-1990
2
1980-2020
2
2016
2
Civil War, 1861-1865
2
1796-1872
1
1869-1934
1
1910-1945
1
1930-2019
1
1934-
1
1945-1989
1
1946-
1
1949-
1
1966-
1
1976-2000
1
1989-1993
1
1991-
1
1992
1
2002-
1
2008
1
2012
1
Appropriations and expenditures, 2008-2013
1
Colonial period, ca. 1600-1775
1
Hasta 1775
1
Modern
1
Periodo colonial, ca. 1600 1775
1
Revolution, 1775-1783
1
Revolution, 1835-1836
1
Silurian
1
To 1775
1
To 1846
1
World War, 1914-1918
1