Era
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20th century
299
21st century
6
Civil War, 1861-1865
66
Colonial period, ca. 1600-1775
4
Cretaceous
4
Eocene
5
From 2 to 10 million years ago
1
From 230 to 570 million years ago
1
From 40 to 55 million years ago
5
From 65 to 140 million years ago
2
From 65 to 190 million years ago
1
Geschichte 1963
1
Jurassic
1
Paleozoic
3
Pliocene
1
Revolution, 1775-1783
1
Siege, 1862
2
Siege, 1863
13
Since 1900
8
Since 1951
8
To 1803
9
To 1863
3
To 1865
17
To 1899
4
To 1931
1
To 1964
6
War of 1812
2
approximately 1764-1824
1
approximately 1829-1922
2
b. 1812 or 13
1
b. 1866
1
ca. 1764-1824
1
ca. 1829-1922
1
d. 1949
1
d. 1991
1