Era
20th century
83
19th century
79
18th century
18
21st century
18
1800-1899
17
19e siècle
12
1819-1880
10
Colonial period, ca. 1600-1775
10
1979
7
Pennsylvanian
7
1900-1999
6
1831
5
1864-1929
5
1876
5
1908-1998
5
Revolution, 1775-1783
5
1700-1799
4
1729-1785
4
1800-1999
4
2000-2099
4
20e siècle
4
Civil War, 1861-1865
4
Paleozoic
4
1732-1796
3
1750-1831
3
1794
3
1844-1916
3
1912-
3
1918-2011
3
1921-
3
1959
3
1982-
3
1644-1708
2
1732-1799
2
1753-1809
2
1755-1819
2
1756-1822
2
1789-1846
2
1800 - 1899
2
1819
2
1824-1901
2
1829-1915
2
1836
2
1862-1893
2
1874-1944
2
1881-1970
2
1883-1938
2
1890-1944
2
18e siècle
2
1912-2006
2
more ...