The Vietnam War stand out as having shaped the nation
He wanted to create a 'League of nations' which would be a coalition of many nations that would help prevent any future wars.
All of the above
The Korean War was fought against not just North Korea, but communism. That goes the same for the Vietnam War. And the Cuban Missile Crisis was HUGE. The fact that the Soviets were storing nukes so close to America, was a huge threat, and almost caused a Cuban war, because of the Bay of Pigs. They thought it would spark up something against the communism stored there, which it did not.
