Final answer:
The Cuban Missile Crisis in 1962 was a tense standoff between the US and the Soviet Union due to the presence of Soviet nuclear missiles in Cuba. It had long-term causes related to the Cold War and had a significant effect on international relations.
Step-by-step explanation:
The Cuban Missile Crisis was a tense standoff between the United States and the Soviet Union in 1962. It was triggered by the discovery of Soviet nuclear missiles in Cuba, just 100 miles from American soil. This event had long-term causes such as the Cold War rivalry between the two superpowers. The crisis had a significant effect on international relations as it led to a period of détente, or relaxation of tensions, between the United States and the Soviet Union. This was achieved through negotiations and the removal of missiles from both Cuba and Turkey.