Era
Civil War, 1861-1865
459
19th century
364
20th century
211
18th century
36
Revolution, 1775-1783
36
Famine, 1845-1852
29
1837-1901
25
Easter Rising, 1916
23
Colonial period, ca. 1600-1775
22
1866-1895
20
To 1848
20
Fenian Invasions, 1866-1870
19
1839-1876
16
1910-1921
16
21st century
16
Rebellion of 1798
16
1860-1890
13
1968-1998
13
1846-1850
12
To 1803
12
War of 1812
12
1917-1963
11
1850-1904
10
To 1846
10
1760-1820
9
1823-1867
9
1848-
9
1848-1860
9
1865-1898
9
1861-1865
8
approximately 1823-1896
8
1809-1865
7
Rising of 1848
7
Spanish colony, 1540-1810
7
To 1172
7
1831-1888
6
1850-1950
6
1865-1918
6
1961-1963
6
1775-1865
5
1800-1899
5
1815-1875
5
1828-1864
5
1831-1890
5
1873-1934
5
1896-1940
5
1908-1957
5
1925-1964
5
1945-
5
1969-
5
more ...