Era
1965-
14
1945-
10
1945-1964
4
20th century
4
21st century
4
1592-1670
3
Colonial period, ca. 1600-1775
3
1868-
2
1900-1999
2
1945-1980
2
1945-1989
2
1949-1976
2
1976-
2
Since 1965
2
1770-1840
1
1783-1809
1
1796-1859
1
1801-1884
1
1819-1900
1
1839-1903
1
1851-1917
1
1863-1937
1
1871-1932
1
1899-1985
1
18th century
1
1929-1968
1
1933-1945
1
1934-
1
1939 - 1945
1
1948-
1
1951-
1
1951-1960
1
1971-1980
1
1978-
1
1979-1983
1
1981-1990
1
1981-2001
1
1982-
1
1985-
1
1991-
1
1991-2000
1
19th century
1
20e siècle
1
Carboniferous
1
Civil War, 1861-1865
1
Since 1945
1
Yearbooks
1