Final answer:
The Eisenhower Doctrine aimed to prevent the spread of international communism in the Middle East and defend Middle Eastern governments against communist forces.
Step-by-step explanation:
Eisenhower expanded the principles of the Truman Doctrine in 1957 with the Eisenhower Doctrine, which extended military assistance to countries in the Middle East. The main objective of the Eisenhower Doctrine was to prevent the spread of international communism in the region and to defend Middle Eastern governments against potential overthrows by communist forces. By providing military aid and support, Eisenhower aimed to reassure Middle Eastern leaders that the United States would stand with them as long as they opposed communism.