Both USA and USSR agreed that if the other attacked then they could engage in all out nuclear war.
In 1961 the US tried to overthrow communist Cuba but it failed
The US put missiles in turkey near Russia.
Were all going to DIE!!!!!!!!
The US was very surprised that the USSR counteracted our gesture when they put missiles in Cuba which is close enough to nuke anywhere in the US.
President JFK made a blockade around Cuba and called it a "quarantine". But the problem is that a blockade is an act of war so according to the MAD policy the USSR could have nuked our whole country.
Because of the MAD policy for 13 days people were freaking out about a nuclear attack from the USSR. In the end JFK and the Soviet leader both agreed to take the nuclear weapons out of Turkey and Cuba.