Era
20th century
105
19th century
50
21st century
45
Civil War, 1861-1865
16
1946-
14
Revolution, 1775-1783
13
2017-2021
11
18th century
10
2001-2009
7
1783-1865
6
1945-
5
1945-1989
5
Colonial period, ca. 1600-1775
5
1818-1895
4
1989-
4
2020
4
2021-
4
1775-1783
3
1913-1994
3
1917-1963
3
1933-1945
3
1933-2020
3
1961-1969
3
1969-1974
3
2009-2017
3
Confederation, 1783-1789
3
1757-1804
2
1783-1789
2
1843-1901
2
1858-1919
2
1861-1865
2
1895-1972
2
1919-1972
2
1929
2
1929-1968
2
1934-2017
2
1942-
2
1944-
2
1947-
2
1948-
2
1953-1961
2
1954-
2
1959-
2
1963-1969
2
1970-
2
1972-
2
1977-1981
2
1980-
2
1981-1989
2
To 1775
2
more ...