Pearl Harbor was allowed to happen

Theorists believe that President Franklin Roosevelt provoked the Japanese attack on the US naval base in Hawaii in December 1942, knew about it in advance and covered up his failure to warn his fleet commanders. He apparently needed the attack to provoke Hitler into declaring war on the US because the American public and Congress were overwhelmingly against entering the war in Europe. Theorists believe that the US was warned by the governments of Britain, the Netherlands, Australia, Peru, Korea and the Soviet Union that a surprise attack on Pearl Harbor was coming and that, furthermore, the Americans had intercepted and broken all the important Japanese codes in the run up to the attack.