Era
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1953-1961
5
1961-1963
5
1485-
4
1775-1865
4
1789-1900
4
17th century
4
1800-1901
4
1865-
4
1919-1998
4
1919-2011
4
1924-
4
1950-
4
1989-1993
4
1990-
4
2009-
4
Civil War, 1861-1865
4
Since 1865
4
Since 1980
4
Since 2009
4
1789-
3
1821-1881
3
1822-1864
3
1830-1903
3
1848-1870
3
1870-1940
3
1871-1933
3
1898-1976
3
1900-2009
3
1910-1936
3
1912-1949
3
1945-1976
3
1955-
3
1957-
3
1980
3
1981-2001
3
2017-2021
3
George III, 1760-1820
3
George IV, 1820-1830
3
Revolution, 1775-1783
3
1600-1699
2
1631-1700
2
1700-1799
2
1737-1809
2
1740-1815
2
1745-1833
2
1775-1783
2
1799-1869
2
1806-1848
2
1815-1898
2
1864-1945
2
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