Era
1990
31
Tertiary
11
1970
10
1992
10
2000
8
20th century
8
1980
7
2004
7
21st century
7
Paleozoic
7
1950
6
1960
5
1979
5
From 2 to 65 million years ago
5
Holocene
5
Miocene
5
Pliocene
5
Quaternary
5
2010
4
Cenozoic
4
Civil War, 1861-1865
4
Devonian
4
Neogene
4
Pliocène
4
Silurian
4
1857-1910
3
1900-1999
3
Colonial period to 1821
3
From 10 to 25 million years ago
3
From 2 to 10 million years ago
3
From 230 to 570 million years ago
3
Miocène
3
Pleistocene
3
Spanish colony, 1565-1763
3
Tertiaire
3
To 1821
3
approximately 1500-1542
3
1800-1899
2
1829-1909
2
1871-1938
2
1900-2099
2
1914-1918
2
19th century
2
2000-2099
2
Cénozoïque
2
Cretaceous
2
From 10 thousand to 2 million years ago
2
From 2 to 25 million years ago
2
From 65 million years ago
2
Huguenot colony, 1562-1565
2
more ...