***...so as to induce Hitler to declare war on us on December 11... ****
We were already in an undeclared war with Germany when the Japs attacked Pearl Harbor.
Have you heard of that ship the good RUBEN JAMES? Sunk by a German U-boat on October 23, 1941.
http://en.wikipedia.org/wiki/USS_Reuben_James_%28DD-245%29
http://www.woodyguthrie.org/Lyrics/Sinking_Of_The_Reuben_James.htm
Yes, adding another piece to the puzzle FDR had designed the previous March (at the latest), or so sayeth Hoover. The question remains, how did FDR gain the complicity of the U-Boat captains?