Answer:
Eisenhower referred to the domino theory
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I was just wondering maybe the answer could be stone tools
The fear of MAD was present with the USA and the Soviet Union. This fear spurred the production of nuclear weapons on both sides in what was called, an "Arms Race". Both powers spent massive amounts of time and money, in a competition to hopefully become the greater threat.
The correct answer is A. religious persecution
The mongol rule occurred at the same time but was not as important as religious persecution. Muslim rule was common earlier during the 6th century, while intellectual oppression was not a recurring issue.
The United States of America joined World War II when Pearl Harbor was bombed...if you're referring to the 2nd World War.