Final answer:
The Cuban Missile Crisis was caused by the Soviet Union's intention to safeguard Cuba from possible aggression by the United States.
Step-by-step explanation:
The cause of the Cuban Missile Crisis was the Soviet Union's desire to protect Cuba from potential aggression by the United States. They placed weapons in Cuba as a defensive measure to ensure the safety of the Cuban regime. Although the weapons were defensive in nature, the United States perceived them as a threat and a sign of aggression.
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