Situational crisis<span> is something that is a </span>crisis<span> to an individual such as death, divorce, rape and so on. An earthquake, though a </span>crisis<span>, is not considered a </span>situational crisis<span>. It involves many people.
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Without innovation in food production, the factories could not have grown so fast.
This is the answer because this fact is mentioned several times in the article.
At the time when John F Kennedy delivered his inaugural address the US and the US were locked in the cold war and people were concerned that the world might be destroyed by nuclear weapons.