sentences:  Eisenhower's protests against longtime allies—Britain and France—during the Suez Canal Crisis meant that the US was the lone western power in the Middle East and placed US oil security in danger as the USSR filled the power vacuum.The Eisenhower Doctrine was a backflip against the previous policy, however; the U.S. now had the burden of military action in the Middle East to itself.The doctrine's military action provisions were only applied in the Lebanon Crisis the following year, when the US intervened in response to a request by that country's then President Camille Chamoun.