Era
Civil War, 1861-1865
45
20th century
34
1929
33
Revolution, 1775-1783
29
19th century
23
21st century
13
1901-1953
7
1783-1865
2
1945-1953
2
1953-1961
2
1969-
2
1756-1836
1
1757-1804
1
1768-1813
1
1818-1895
1
1829-1909
1
1839-1876
1
1842-1933
1
1847-1882
1
1856-1924
1
1863-1951
1
1879-1935
1
1893-1958
1
1895-1948
1
1895-1983
1
1897-1937
1
18th century
1
1902-1974
1
1914-1981
1
1915-2003
1
1920-1978
1
1921-2006
1
1933-1945
1
1936-
1
1946-
1
1960-
1
1971-1980
1
1980-2020
1
1981-2001
1
1989-
1
1992-2012
1
2001-2009
1
2009
1
2009-
1
Colonial period, ca. 1600-1775
1