Era
20th century
52
To 1964
49
19th century
32
1960-1980
26
1975-
26
1865-1918
22
To 1865
16
1918-1945
14
1945-
13
1933-1945
12
1964-
12
1964-1975
12
1980-
12
1917-
8
1917-1945
8
1783-1865
6
18th century
6
20e siècle
6
1900-1999
5
1918-1932
5
Jusqu'à 1865
5
1700-1799
4
1898-
4
1918-
4
1945-1989
4
1948-
4
1960-
4
To 1863
4
18e siècle
3
1914-
3
Civil War, 1861-1865
3
To 1775
3
1775-1865
2
1800-1899
2
1839
2
1865-1898
2
1865-1900
2
1868-1963
2
1868?-1940
2
1877-1964
2
1880-1935
2
1919-1933
2
1933-
2
1945-1953
2
1952-
2
1970-
2
19e siècle
2
Colonial period, ca. 1600-1775
2
Famine, 1845-1852
2
Since 1917
2
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