If you know any conspiracy theories please tell me them and make sure they're reasonable. Tell me things in general the government wouldn't want me to know.
If you have a source post that too.
Also debate why or why not it is plausible.
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Roosevelt likely did know that Japan was about to attack Pearl Harbor, and allowed the attack to happen in order to get the USA into the war. After all, the USA had already broken the Japanese diplomatic codes, and were reading them at the same time the Japanese diplomats were. Its very likely that they had the Japanese military codes as well, at that time. There were too many lucky breaks for Japan during that attack.