Era
20th century
195
21st century
116
19th century
50
18th century
15
Revolution, 1775-1783
9
17th century
8
Colonial period, ca. 1600-1775
8
1933-1945
7
Early modern, 1500-1700
7
1809-1865
6
Civil War, 1861-1865
6
1917-1963
5
16th century
4
1858-1919
4
1864?-1943
4
1929-1968
4
1819-1892
3
1822-1913
3
1867-1957
3
1892-1973
3
1902-1967
3
1919-1972
3
1929
3
Bombardment, 1945
3
To 332 B.C.
3
-1400
2
1118?-1170
2
1564-1616
2
1706-1790
2
1732-1799
2
1775-1865
2
1809-1868
2
1840-1926
2
1873-1947
2
1875-1955
2
1879-1955
2
1884-1962
2
1886-1957
2
1890-1969
2
1897-1993
2
1908-1960
2
1918-1945
2
1918-1990
2
1941-1955
2
1942-
2
1945-
2
1949-
2
1950-
2
1960-1980
2
1973-
2
more ...