Era
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1770-1838
5
1783-1815
5
1789-1934
5
1866-1895
5
1910-1946
5
1945-
5
1754-1816
4
1789-1899
4
1789-1903
4
1798-1859
4
1800-1903
4
1830-1885
4
1831-1890
4
1884-1968
4
1900-2099
4
Civil War, 1960-1996
4
King William's War, 1689-1697
4
Revolution, 1910-1920
4
Since 1994
4
1540-1810
3
1548-1820
3
1718-1779
3
1773-1854
3
1774-1809
3
1790-1866
3
1800-1999
3
1809-1865
3
1815-1861
3
1822-1909
3
1829-1909
3
1861-1865
3
1862-1865
3
1895-1970
3
1946-
3
1980-
3
1988-2000
3
Conquest, 1522-1548
3
Since 1985
3
To 1846
3
approximately 1756-1830
3
1500-1820
2
1565-1763
2
1600-1699
2
1600-1865
2
1640-1703
2
1689-1697
2
1696-1785
2
1732?-1836
2
1742-1807
2
1767-1838
2
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