World communism ideology could not admit that, to counter the influence of capitalist countries. It also supported revolutionary socialism around the world to continue to work toward world communism, however distant it might be. Thus it backed the 26th of July Movement in the Cuban Revolution, the North Vietnamese in the Vietnam War and the MPLA in the Angolan Civil War. The domino theory of the Cold War was driven by this intent as anti-communists feared that isolationism by capitalist countries would lead to the collapse of their self-defense. The reform and opening of China and the restructuring and openness of the
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