Suez Crisis led to a withdrawal. U.S. President Dwight D. Eisenhower had strongly warned Britain not to invade; he threatened serious damage to the British financial system by selling the US government's pound sterling bonds. Historians conclude the crisis "signified the end of Great Britain's role as one of the world's major powers". The Suez Canal was closed from October 1956 until March 1957. Israel fulfilled some of its objectives, such as attaining freedom of navigation through the Straits of Tiran, which Egypt had blocked to Israeli shipping since 1950. As a result of the conflict, the United Nations created the UNEF
Suez Crisis turned away from acting as a great imperial power. During the 1960s there was much speculation that Prime Minister Harold Wilson's continued refusals to send British troops to Vietnam, even as a token force, despite President Lyndon B. Johnson's persistent requests, were partially due to the Americans failing to support Britain during the Suez Crisis. Edward Heath was dismayed by the U.S. opposition to Britain during the Suez Crisis; as Prime Minister in October 1973 he refused the U.S. permission to use any of the UK's air bases to resupply during the Yom Kippur War, or to allow the Americans