A. Eisenhower Doctrine
This was so that any Middle Eastern state who felt under aggressive pressure from another country could ask for the help of the United States. Although he did not explicitly state that it was for Communist or Soviet aggression, this has been widely mentioned as being the motivating factor for the President's speech in front of Congress. Eisenhower felt that if he had a strong stance against the Soviet Union, this would help the Soviets from advancing into different continents and implementing their Communist views.