Fear that an enemy might create them first or make them more powerful.
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The USA built the first nuke.
The atomic bomb was created by scientists of a number of nationalities working as part of the Manhattan Project during World War 2.
The Nuke Was made in 1945. If Your asking Why, sorry for the other answer, but tell wasn't it funny!? THE NUKE WAS MADE FOR KILLING, MADE FROM THE IDEA OF SAVAGE OLDTIMERS. Nope, that's not it. it was made to increase the conflict of WARFARE.
It is short for Nuclear.
By us do you mean United States? If so probably not, since they cant reach us. If any one they would nuke Japan or South Korea, they would be dumb to nuke China or Russia. pssh. nig we screwed.