@Chights47,
1. MAD--mutual assured destruction
2. No, we didn't study it in school, we lived it.
I can't believe your question number three. It was shirts versus skins.
4. The building of the Berlin Wall, and subsequent reports of those who were killed trying to cross the wall, or who successfully tunneled from East Berlin to West Berlin. The Cuban revolution, when Castro was our buddy, and then he suddenly became the Devil incarnate.
But the biggie was the Cuban missile crisis--look it up, if you need to.