Era
2000-
12
20th century
5
21st century
4
1935-
3
1951-
3
1976-2000
3
1976-2002
3
2002-
3
To 1500
3
1931-1945
2
1949-
2
1955-2017
2
1976-
2
1991-
2
1997-
2
16th century
1
17th century
1
1937-1945
1
1939-1945
1
1989-
1
19th century
1
2001-
1
880-956
1
Carboniferous
1
Empire, 30 B.C.-284 A.D.
1
Five dynasties and the Ten kingdoms, 907-979
1
Han dynasty, 202 B.C.-220 A.D.
1
Permian
1
Republic, 265-30 B.C.
1
Sui dynasty, 581-618
1
Tang dynasty, 618-907
1
Tiananmen Square Incident, 1989
1