Winston Churchill's Conservative Party lost the July 1945 general election, forcing him to step down as Prime Minister of the United Kingdom. For six years he served as the Leader of the Opposition. During these years he continued to influence world affairs. National Security Act, US military and foreign-policy reform legislation was signed into law by President Harry S Truman in July 1947 which reorganized the structure of the US armed forces following World War II. On July 26, 1956 Egyptian President Gamal Abdel Nasser announced the nationalization of the Suez Canal Company, the joint British-French enterprise which had owned and operated the Suez Canal since its construction in 1869. On July 26, 2016, Hillary Clinton became the first woman to be nominated for president by a major political party at the Democratic National Convention in Philadelphia.