Kennedy invokes the experience of the 1930s to argue that failing to resist aggressive behaviour can make a later and larger conflict more likely. The historical reference points particularly to the expansion of Nazi Germany and the belief, influential after the Second World War, that earlier resistance might have limited further aggression.

During the Cuban Missile Crisis, Kennedy used this analogy to justify opposing the Soviet deployment of nuclear missiles in Cuba while insisting that the United States sought to avoid war. His argument was that restraint should not become acquiescence: allowing a threatening action to proceed without challenge might encourage further pressure and create greater dangers later. The quotation therefore shows how historical interpretation can shape contemporary policy. It presents the 1930s as a warning that preventing conflict may sometimes require confronting aggression before it becomes more difficult to contain.

Full quotation

“The 1930’s taught us a clear lesson: aggressive conduct, if allowed to go unchecked and unchallenged ultimately leads to war. This nation is opposed to war. We are also true to our word. Our unswerving objective, therefore, must be to prevent the use of these missiles against this or any other country, and to secure their withdrawal or elimination from the Western Hemisphere.”