1954 in the Vietnam War 5 April The National Security Council met again to consider U.S. intervention at Điện Biên Phủ. The Army, including Army Chief of Staff General Matthew Ridgway, was negative, stating that U.S. intervention would require 7 army divisions and heavy air support. 7 April President Eisenhower used the phrase "falling dominoes" in a press conference. This was the origin of the domino theory which postulated that if Vietnam became communist the other nearby states would soon follow. The domino theory was a prominent justification for the Vietnam War in the United States during the 1960s. 14 April Secretary of State John
Pius XII, The Holocaust, and the Cold War later asserting that "Loftus and Aaron told a tale that was mostly accurate."" David Kertzer wrote in "The American Historical Review" ""The new material that Phayer has brought to light from the National Archives offers a useful contribution to our understanding of the controversial relationship between the Vatican and the perpetrators of the Holocaust, especially in the postwar period"." Pius XII, The Holocaust, and the Cold War Pius XII, The Holocaust, and the Cold War is a 2008 book by historian Michael Phayer which makes use of documents that had been released under US President Bill Clinton's 1997 executive order