The document discusses whether FDR knew about the attack on Pearl Harbor in advance. Some believe FDR must have known because the US had cracked Japanese codes and intercepted messages warning of impending attacks in the Pacific, including on Pearl Harbor. However, others argue that when FDR learned of the attack, he seemed genuinely surprised and calm, not as though he had expected it. The question of FDR's advance knowledge remains debated, as evidence exists both for and against the idea that he allowed the attack to occur.