The term Kennedy chose to describe his sealing off of Cuba to prevent Soviet shipments of weapons or supplies was 'quarantine'.
In 1952, he was elected to the U. S. Senate for the foremost of two terms. In his speech on 22nd October 1962, he declared that US spy aircraft have discovered Soviet missile bases in Cuba island.
The use of the term, "quarantine" legally differentiated this activity from a blockade that was deemed a state war existed; the use of "quarantine" rather than "blockade" also encouraged to accept the backing of the Organization of the American States.
More about Kennedy's speech:
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