Era
Colonial period, ca. 1600-1775
31
20th century
14
19th century
12
Revolution, 1775-1783
8
Period
7
Civil War, 1861-1865
6
1914-1918
4
1809-1865
3
1648-1789
2
1732-1799
2
1775-1865
2
1786-1853
2
1804-1869
2
1952-
2
Revolution (1775-1783)
2
Since 1952
2
War of 1812
2
ca. 1600-1775
2
1564-1616
1
1590-1679
1
1620?-1700
1
1714-1738
1
1781
1
1782
1
1783
1
1784-1850
1
1789-1900
1
1803-1882
1
1807-1892
1
1812-1815
1
1819-1892
1
1825-1874
1
1828-1835
1
1843
1
1846
1
1847
1
1848-1920
1
1863-1933
1
1865-
1
1875-
1
18th century
1
1900-1999
1
1911-
1
1914-
1
1914-9999
1
1917-1945
1
1923-
1
1951-
1
1979-
1
1979-1990
1
more ...