July 7: A supposedly downed extraterrestrial spacecraft is reportedly found in the Roswell UFO incident, near Roswell, New Mexico, which was written about by Stanton T. Friedman.

July 10: Princess Elizabeth announces her engagement to Lieutenant Philip Mountbatten.

July 11: The Exodus leaves France for Palestine, with 4,500 Jewish Holocaust survivor refugees on board.

July 17: The Indian passenger ship Ramdas is capsized by a cyclone at Mumbai, India, with 625 people killed.

July 18: Following wide media and UNSCOP coverage, The Exodus is captured by British troops and refused entry into Palestine at the port of Haifa. - President Harry S. Truman signs the Presidential Succession Act into law, which places the Speaker of the House and the President Pro Tempore of the Senate next in the line of succession after the Vice President.

July 26: Cold War: U.S. President Harry S. Truman signs the National Security Act of 1947 into law, creating the Central Intelligence Agency, the Department of Defense, the Joint Chiefs of Staff, and the National Security Council.

July 29: After being shut down on November 9, 1946, for a refurbishment, the ENIAC computer, the world's first electronic digital computer, is turned back on again. It next remains in continuous operation until October 2, 1955. (source: Wikipedia)