During which event was the world closest to nuclear war during the cold war?

a. the korean war
b. the vietnam war
c. the berlin blockade
d. the cuban missile crisis

The correct answer is D. The Cuban Missile Crisis. This is because the USSR built nuclear misslies in Cuba. This gave the USSR first strike capabilities on the US. The threat of nuclear war was imminent because the USSR could've launched at any time. However, the missiles were eventually disassembled and sent back to the USSR.