On 7 December 1941, Japan attacked the US naval base at Pearl Harbor. It’s one of the most notorious surprise attacks in history, but how much of a surprise actually was it? Did President Franklin Roosevelt know that the attack was coming and even encourage it as a means of propelling the US into World War Two? 

In the first episode of season 2 of History’s Greatest Conspiracy Theories, the Pulitzer Prize-winning journalist Steve Twomey joins Rob Attar to tackle the "back door to war" conspiracy theory, explaining why many

History’s Greatest Conspiracy Theories is produced by the team behind BBC History Magazine. For more fascinating stories from the past, head to HistoryExtra, the home of ‘History’s Greatest’ podcasts. There you can find other feeds including History’s Greatest Cities and HistoryExtra LongReads. Find out more at ⁠historyextra.com/podcast⁠.

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This episode was hosted by Rob Attar and produced by Jack Bateman.

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