Era
20th century
440
1900-1999
178
19th century
127
21st century
125
2000-2099
49
1945-1989
35
Since 1900
31
1865-1950
29
1933-1945
29
1775-1865
25
18th century
25
1951-
23
1989-
23
1800-1899
22
1960-
21
1945-
18
1988-
18
1998-
16
1990-
15
1948-
14
1991-
14
2001-2009
14
17th century
13
1918-1933
13
1975-
13
1980-
13
Civil War, 1861-1865
13
1946-
12
1976-2002
12
To 1500
12
1964-1985
11
2002-
11
1815-1861
10
1918-1945
10
1945-1953
10
Since 1945
10
Since 1991
10
To 1775
10
1919-1933
9
2009-2017
9
Since 1988
9
To 1950
9
1789-1815
8
1837-1901
8
1870-1940
8
1919-1947
8
1955-1983
8
1958-
8
1979-1997
8
Tiananmen Square Incident, 1989
8
more ...