1. The U.S. government had no knowledge of a potential Japanese attack before Dec. 7.
Beyond the obvious signs of Japan's increasing aggression — including its sinking of an American naval vessel in the Yangtze Riverand its signing of the Tripartite Pact with fascist Italy and Nazi Germany — various specific war warnings had been sent by Washington to military commanders in the Pacific for some days before Dec. 7.
The War Department had been intercepting and analyzing secret cables between Tokyo and the Japanese Embassy in Washington and thought at one point that the Japanese would attack Hawaii on Sunday, Nov. 30. A Hawaii newspaper even warned, in a blaring headline, of a possible attack.