Reply #5: I don't agree that there is hard evidence that he knew

[Frances]

Pearl Harbor specifically was coming, but he did know that we would probably get drawn into the war. FDR did what he could to prepare the U.S. for war, but the overwhelming majority of people in the U.S. at that time were isolationists. They said things like, "George Washington warned us not to get involved in foreign entanglements" and "We went over there and fought in World War I and the Europeans never paid us back what they owed us."