Historical Period
20th century
87
21st century
37
19th century
35
1946-
30
1809-1865
28
2001-2009
20
1945-1989
18
1991-
16
1976-2002
13
1989-
13
1861-1865
12
2002-
12
1981-1989
10
1890-1969
9
18th century
8
1933-1945
8
1945-
8
Civil War, 1861-1865
8
1952-
7
1953-1961
7
1980-
7
1989-1993
7
2001-
7
1882-1945
6
1960-
6
2000-
6
1469-1527
5
1732-1799
5
2009-2017
5
1783-1865
4
1865-1933
4
1908-1973
4
1913-1921
4
1924-
4
1937-2006
4
1939-
4
1947-
4
1949-
4
1953-
4
1963-1969
4
1965-
4
1980-2020
4
1993-2001
4
Since 1991
4
Tiananmen Square Incident, 1989
4
1858-1919
3
1864-1920
3
1866-1925
3
1871-1937
3
1871-1949
3
more ...