Era
20th century
12
21st century
10
19th century
4
1989-
3
1900-1999
2
1958-
2
2000-2099
2
2002-
2
1819-1891
1
1884-1915
1
1886-1964
1
1907-1964
1
1918-1984
1
1919-
1
1929-1945
1
1939-1945
1
1945-1960
1
1945-1989
1
1946-
1
1947-
1
1952-
1
1962-
1
1966-
1
1971-1990
1
1972-
1
1976-2002
1
1997-
1
2000-
1
2001
1
2001-2009
1
2009-
1
2010
1
Civil War, 1861-1865
1
Since 1976
1
Since 2002
1