Final answer:
Kennedy's action during the Cuban Missile Crisis was an exercise of implied executive power.
Step-by-step explanation:
The action taken by Kennedy during the Cuban Missile Crisis, specifically the stopping of shipments in or out, can be considered as an exercise of implied executive power. Implied executive power refers to powers that are not explicitly stated in the Constitution, but are inferred from the powers granted to the President. In this case, Kennedy's action was seen as necessary to protect national security and prevent a potential nuclear war.
Learn more about Cuban Missile Crisis