Era
19th century
56
20th century
46
Civil War, 1861-1865
35
Revolution, 1775-1783
31
Colonial period, ca. 1600-1775
29
18th century
22
1917-1945
15
1732-1799
13
1917-
13
1783-1865
12
1865-1918
12
1900-1999
12
1917-1921
11
1964-
11
1809-1865
10
19e siècle
10
Since 1917
9
1775-1783
8
1866-1953
8
1946-
8
20e siècle
8
21st century
8
1767-1845
7
1800-1899
7
1869-1934
7
1933-1945
7
1939-1945
7
1778-1846
6
1804-
6
1887-1940
6
1914-1918
6
1918-1945
6
Since 1804
6
To 1783
6
War of 1812
6
1732-1810
5
1767-1848
5
1779-1843
5
1959-
5
1700-1899
4
1775-1865
4
1815-1861
4
1828
4
1865-1950
4
1918-
4
1945-1992
4
2000-2099
4
2017-2021
4
World War, 1939-1945
4
1738-1822
3
more ...