Era
20th century
26
1900-1999
15
19th century
6
1822-1913
5
1800-1899
4
1910-1985
4
Civil War, 1861-1865
4
1775-1783
3
1862-1931
3
1949-
3
2000-2099
3
2003-2011
3
21st century
3
Revolution, 1775-1783
3
-1617
2
1718-1780
2
1783-
2
1800-1999
2
1820-1906
2
1823-1900
2
1850-1929
2
1863-1954
2
1868-1963
2
1880-1964
2
1888-1936
2
1896-1977
2
1897-1937
2
18th century
2
1900-
2
1914-1960
2
1929 or 1931-2016
2
1929-1993
2
1941-
2
1973-
2
Revolution, 1910-1920
2
approximately 1790-1846
2
-1400
1
1347-1394
1
1533-1603
1
1585 or 1586-1639
1
1585-1645
1
1599-1672
1
1600-1699
1
1645-1709
1
1646-1724
1
1647-1717
1
1656-1680
1
1672-1751
1
16th century
1
1700-1799
1
more ...