I don’t understand your question what do you need help with?
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.
The answer is TRUE. Prehistory is define as the time before the people could write, or it was the time before recording events started. It denotes that it was the time that people are still writing on the walls and on the rocks.
Allow is to permit while find is to look
