beats Stade Reims 4–3 at Parc des Princes, Paris and wins the 1955–56 European Cup (football). June 14 – The Flag of the United States Army is formally dedicated. June 15 – Eindhoven University of Technology is founded in Eindhoven, The Netherlands. June 18 – The last British troops leave Egypt. June 21 – Playwright Arthur Miller appears before the House Un-American Activities Committee in Washington, D.C. June 23 – Gamal Abdel Nasser becomes the 2nd president of Egypt, a post he holds until his death in 1970. June 28 Poznań 1956 protests: Labour riots in Poznań, Poland, are crushed with heavy loss of life. Soviet troops fire at a crowd protesting high prices, killing 53 people. The film version of Rodgers and Hammerstein's The King and I, starring Deborah Kerr and Yul Brynner, is released only a few months after the film version of R&H's Carousel. It becomes the most financially successful film version of a Rodgers and Hammerstein musical up to this time, and the only one to win an acting Oscar (Yul Brynner wins Best Actor for his performance as the King of Siam). It is also one of two Rodgers and Hammerstein films to be nominated for Best Picture (which it does not win). June 29 Actress Marilyn Monroe marries playwright Arthur Miller, in White Plains, New York. President Dwight D. Eisenhower signs the Federal Aid Highway Act of 1956, creating the Interstate Highway System in the United States. June 30 – 1956 Grand Canyon mid-air collision: A TWA Lockheed Constellation and United Airlines Douglas DC-7 collide in mid-air over the Grand Canyon in Arizona, killing all 128 people aboard both aircraft, in the deadliest civil aviation disaster to date; the accident leads to sweeping changes in the regulation of cross-country flight and air traffic control over the United States. July July 2 – A laboratory experiment involving scrap thorium at Sylvania Electric Products in Bayside, New York, results in an explosion. July 4 – An American Lockheed U-2 reconnaissance aircraft makes its first flight over the Soviet Union. July 8 – The mountain Gasherbrum II, on the border of Pakistan and China, is first ascended, by an Austrian expedition. July 9 – The 7.7 Amorgos earthquake shakes the Cyclades island group in the Aegean Sea, with a maximum Mercalli intensity of IX (Violent). The shaking and the subsequent tsunami leave 53 people dead. July 10