Era
20th century
21
1865-
15
19th century
11
1789-1797
9
18th century
9
Revolution, 1775-1783
9
1775-1865
8
Colonial period, ca. 1600-1775
8
1775-1783
7
Revolution
7
1865-1950
5
To 1775
5
1732-1799
4
1792-1864
4
1861-1865
4
1920-
4
1815-1861
3
1825-1829
3
1828
3
1869-1877
3
1900-1999
3
1945-
3
1783-1789
2
1797-1801
2
1904-
2
1920-1991
2
1921-
2
1933-1945
2
1933?-
2
1938-
2
1943-
2
b. 1837
2
1644-1718
1
1706-1790
1
1729?-1798
1
1737-1801
1
1737-1809
1
1740-1821
1
1741-1811
1
1745-1821
1
1758-1803
1
1759-1865
1
1760-1820
1
1762-1835
1
1769-1798
1
1772-1833
1
1772-1860
1
1777-1852
1
1783-1809
1
1783-1865
1
more ...