Era
20th century
20
Devonian
10
1858-1919
9
19th century
6
Silurian
5
21st century
3
Pleistocene
3
1898-1951
2
Cretaceous
2
Revolution, 1775-1783
2
-1994
1
1734-1821
1
1782-1862
1
1793-1855
1
1798-1828
1
1801-1848
1
1805-1844
1
1822-1913
1
1828-1895
1
1835-1910
1
1836-1903
1
1844-1917
1
1845-1904
1
1881-1955
1
1887-1944
1
1888-1960
1
1902-1979
1
1915-1953
1
1918-1953
1
1918-1990
1
1921-1930
1
1923-1988
1
1926-1966
1
1929
1
1945-1953
1
1946-
1
1949-
1
1951-
1
1953-2019
1
1957-
1
Cambrian
1
Ordovician
1
Precambrian
1
War of 1812
1
approximately 1756-1830
1