Answer:
President Kennedy's address on Cuba initially heightened concerns and anxiety among Americans due to the gravity of the Cuban Missile Crisis. The revelation of Soviet nuclear missiles near U.S. shores raised fears of a potential nuclear war. However, Kennedy's firm response and clear communication helped instill a sense of security in Americans, as they saw their leader taking decisive action to protect national interests. The successful resolution of the crisis, with the removal of the missiles through negotiations, further reassured Americans and restored their confidence in the government's ability to handle foreign threats. Overall, while causing initial alarm, Kennedy's address ultimately helped restore Americans' sense of security from foreign threats.