Era
20th century
97
21st century
53
1946-
23
19th century
21
Revolution, 1775-1783
20
1952-
18
Civil War, 1861-1865
13
1805-1875
10
1969-
10
1955-
9
18th century
8
1743-1826
7
1834-1917
7
1866-1944
7
1901-1989
7
1944-
7
2003-
7
2020
7
Russian Invasion, 2022-
7
War of 1812
7
1948-
6
1997-
6
2017-
6
1839-1906
5
1929-1968
5
1960-
5
1961-
5
1978-
5
1980-
5
2009-
5
2021-
5
To 146 B.C.
5
1564-1616
4
1642-1727
4
1748-1826
4
1812-1870
4
1840-1926
4
1847-1931
4
1895-1966
4
1929
4
1933-1945
4
1935-
4
1945-
4
1954-
4
1975-1985
4
1985-1991
4
1991-
4
2016
4
2017-2021
4
Civil War, 2011-
4
more ...