Answer:
The creation of the Berlin Wall.
Step-by-step explanation:
This is the only event that actually takes place during the Kennedy presidency.
The Iran Contra Scandal takes place during the presidency of Ronald Reagan.
The Watergate scandal and a man landing on the moon take place during the presidency of Richard Nixon.
However, Kennedy is president when the Soviet Union decides to build a wall to split East and West Berlin during 1961. This wall will come to symbolize tensions between communism and capitalism throughout the Cold War.