Era
20th century
11
1946-1970
3
1960-
3
1970-1988
3
19th century
3
Since 1900
3
18th century
2
1949-
2
1960-1980
2
1495?-1525
1
1603-1714
1
1700-1799
1
1700-1999
1
1743-1803
1
1775-1865
1
1791-1804
1
17th century
1
1800-1899
1
1849-1861
1
1900-1999
1
1989-
1
Civil War, 1861-1865
1
Revolution, 1775-1783
1
Revolution, 1791-1804
1
Since 1989
1