The Pearl Harbor advance-knowledge conspiracy theory is the argument that U.S. Government officials had advance knowledge of Japan's December 7, 1941, attack on Pearl Harbor. Ever since the Japanese attack, there has been debate as to how and why the United States had been caught off guard, and how much and when American officials knew of Japanese plans for an attack.[1][2] In September 1944, John T. Flynn,[citation needed] a co-founder of the non-interventionist America First Committee,[3] launched a Pearl Harbor counter-narrative when he published a forty-six page booklet entitled The Truth about Pearl Harbor.[citation needed]
Several writers, including journalist Robert Stinnett,[4] retired U.S. Navy Rear Admiral Robert Alfred Theobald,[5] and Harry Elmer Barnes[6] have argued various parties high in the U.S. and British governments knew of the attack in advance and may even have let it happen or encouraged it in order to force America into the European theatre of World War II via a Japanese–American war started at "the back door".[7][8]
Evidence supporting this view is taken from quotations and source documents from the time[9][page needed] and the release of newer materials. However, the Pearl Harbor advance-knowledge conspiracy is considered a fringe theory and is rejected by historians. [10
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