A few years after the end of World War II, the world polarized into the Western camp centered around the US and the Eastern camp centered around the Soviet Union, respectively promoting capitalism and communism. The competition between these differing social systems was called the "Cold War," and the Truman Doctrine is usually considered to be its starting point.
The conflict escalated, and the camps raced to expand their nuclear weapons based on the principle of nuclear deterrence. As a result, they accumulated more than enough nuclear power to destroy each other, and humanity was increasingly threatened with annihilation in the event of total nuclear war. It has now become clear that the principle of nuclear deterrence should be abandoned, and we must enter an age in which all parties seek a path to mutual existence.
Nuclear Weapons Crises
(When the Use of Nuclear Weapons was Contemplated by the US)
1946
March
Deployment of Soviet army in Iran.
November
Shooting down of a US plane by Yugoslavia.
1948
April-June
Sealing off of West Berlin by Soviet Union.
1950
June
Break-out of Korean War.
1953
August
Deterioration of Korean War.
1954
April-May
Offer to supply A-bomb to French Army on Vietnam front.
August
China declares intent to liberate Taiwan.
1956
October
Second Middle East War (Suez Crisis).
1958
July
Coup d'etat by Iraq's military and the Taiwan Strait crisis.
1959
May
Berlin issue.
1961
June
Same as above.
1962
October
Cuban missile crisis.
1968
January
Seizure of USS Pueblo by North Korea.
February
Vietnam War (Battle of Quesan).
1969
November
Intensification of Vietnam War.
1970
September
Invasion of Jordan by Syria.
1973
October
Desire to halt Fourth Middle East War.
1980
January
Desire to halt Iran crisis.
1991
January
Anticipation of chemical weapons use by Iraq in Persian Gulf War.