How World War II marked a watershed in the twentieth century?

Solution,

World War II was the defining moment of the twentieth century, a time when life and liberty were being extinguished around the world, and civilization itself was in peril. The creation of the nuclear bomb was a watershed event of World War II in which more that 60 million people died. The United States thought that with the creation of the bomb and having such a weapon, they would no longer have to get involved in wars and would have peace.

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