1931 Manchurian Incident.
1937 Second Sino-Japanese War starts.
1941 Pacific War starts.
1945 Japan surrenders after two atomic bombs are dropped over Hiroshima and Nagasaki.
1946 The new constitution is promulgated.
1952 The Allied Occupation of Japan ends.
1956 Japan becomes member of the UN.
1972 Normalization of relations to China.
1973 Oil crisis.