Era
20th century
287
21st century
127
19th century
118
18th century
32
1946-
16
Civil War, 1861-1865
16
17th century
14
Revolution, 1775-1783
13
2017-2021
11
1945-
9
Colonial period, ca. 1600-1775
9
1933-1945
8
1564-1616
7
1940-
7
2001-2009
7
16th century
6
1783-1865
6
1945-1989
6
1989-
6
1991-
6
1918-1945
5
1952-
5
1801-1917
4
1818-1895
4
1917-1963
4
1960-
4
1970-
4
2020
4
2021-
4
1475-1564
3
1606-1669
3
1775-1783
3
1913-1994
3
1929
3
1929-1968
3
1933-2020
3
1947-
3
1948-
3
1949-
3
1959-
3
1961-1969
3
1969-1974
3
2009-2017
3
Confederation, 1783-1789
3
Conquest, 1519-1540
3
German occupation, 1940-1945
3
-1516
2
1533-1917
2
1757-1804
2
1783-1789
2
more ...