The theory that the threat of nuclear war is enough to prevent an attack is called: Nuclear deterrent
The theory is based on the likelihood that every nations would fear a mutual destruction when initiating attack to countries that own nuclear weapon. Even if a country emerge victorious from a nuclear war, the damage that caused by opposition's nuclear would damage the environment of the victors for decades.
Not all all compared to the Japanese.
Considering Pearl Harbor was a Military installation, of course it was prepared to an extent, there were people that had the job of waiting for an attack, that would then man the AA guns and other defenses.
However they were not as prepared as they could have been if they knew something was coming, heck, they weren't even in the war at this point.
The Japanese had months, maybe years (I forgot) to plan this attack. It was well coordinated and obviously took a big tole on the Americans.
So no, the Americans were not that well prepared for what had come.
Hope this helps!
Answer:
The Cold War was a period of geopolitical tension between the Soviet Union and the United States and their respective allies, the Eastern Bloc and the Western Bloc, after World War II. The period is generally considered to span the 1947 Truman Doctrine to the 1991 dissolution of the Soviet Union.
Explanation:
It would be the Cold War between the US and the Soviet Union in which Reagan fought any progressive movements like the Sandinistas in NIcaragua by funding the contras and also he bombed Kaddafi in Libya by trying to make him out to be a tyrant when in fact it turns out that he transformed Libya into one of the most modern and progressive countries in Africa under him.