Era
20th century
163
21st century
45
19th century
30
1945-1989
21
1989-
15
18th century
9
1780-1831
7
Civil War, 1861-1865
7
To 500
7
1933-1945
6
2001-2009
6
Revolution, 1775-1783
6
1945-
5
1975-1985
5
1912-1988
4
1945-1955
4
active 6th century B.C.
4
1939-
3
1997-
3
Medieval, 500-1500
3
To 146 B.C.
3
To 1500
3
War of 1812
3
1886-1950
2
1891-1944
2
1896-1993
2
1911-1988
2
1916-2009
2
1917-1936
2
1927-2019
2
1937-2006
2
1937-2014
2
1945-1953
2
1977-1981
2
1993-
2
1993-2001
2
1066-1485
1
1328-1589
1
1452-1519
1
146 B.C.-323 A.D.
1
1649-1660
1
16th century
1
1743-1826
1
1767-1845
1
1784-1864
1
1789-1900
1
17th century
1
1801-1809
1
1815-1875
1
1827-1895
1
more ...