There are currently no nuclear weapons big enough that just one could destroy the US. It is possible that enough of them could pretty much destroy our way of life for decades to come.
The nuclear bomb AKA the cold war. The cold war was an arms race against the USSR and the US to see who could get the most destructive and best nuclear weapon of all time.
they were thought to have given nuclear bomb information to the soviets
The Cold War and nuclear arms races in the late forties through the eighties was the impetus of Americans building bomb shelters. They were convinced Russia would bomb America and they could have if Kennedy had not stopped Fidel Castro and the Russians from sending over their nuclear missiles located ninety miles from the US. Most of the bomb shelters were a joke. They never could have protected the people from the radiation in the air or from the bomb explosion.
When the Soviet Union exploded an atomic bomb, the US response was to increase its own arsenal and its own testing of nuclear weapons.
He was a atomic bomb spy who supplied the Russians with detail plans for construction of nuclear weapons.
The U.S. has thousands of nuclear weapons. It could probably turn the entire world, to say nothing of North Korea, into a nuclear wasteland if it felt like it.
Absolutely not.
In the same way that any weapon would be used as a threat- If you do this, I will do that. For many years, the US and the Soviet Union had a strategy known as MAD- Mutually Assured Destruction- If we are attacked with nuclear weapons, we will respond with Nuclear Weapons. You have enough to destroy us, but we would also destroy you.
They wouldn't dare, but could they? Yes.
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To end WWII.
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Doubtful.