When Dwight D. Eisenhower was sworn in as U.S. President in 1953, the Democrats lost their two-decades-long control of the U.S. presidency. Under Eisenhower, however, the United States' Cold War policy remained essentially unchanged. Whilst a thorough rethinking of foreign policy was launched (known as "Operation Solarium"), the majority of emerging ideas (such as a "rollback of Communism" and the liberation of Eastern Europe) were quickly regarded as unworkable. An underlying focus on the containment of Soviet communism remained to inform the broad approach of U.S. foreign policy.