It's always shocked me how many 9/11 conspiracy theories people buy into, where there exists significantly more evidence that FDR knew of Pearl Harbor a day or so in advance, but allowed it to happen in order to push a reluctant US into war.
It is very likely that he did. In my fairly rudimentary research on the matter I would say it's almost a certainty. That's a leader's job.
Later in the conversation, Gilbert recorded Goering's observations that the common people can always be manipulated into supporting and fighting wars by their political leaders:
We got around to the subject of war again and I said that, contrary to his attitude, I did not think that the common people are very thankful for leaders who bring them war and destruction.
"Why, of course, the people don't want war," Goering shrugged. "Why would some poor slob on a farm want to risk his life in a war when the best that he can get out of it is to come back to his farm in one piece. Naturally, the common people don't want war; neither in Russia nor in England nor in America, nor for that matter in Germany. That is understood. But, after all, it is the leaders of the country who determine the policy and it is always a simple matter to drag the people along, whether it is a democracy or a fascist dictatorship or a Parliament or a Communist dictatorship."
There is one difference," I pointed out. "In a democracy the people have some say in the matter through their elected representatives, and in the United States only Congress can declare wars."
"Oh, that is all well and good, but, voice or no voice, the people can always be brought to the bidding of the leaders. That is easy. All you have to do is tell them they are being attacked and denounce the pacifists for lack of patriotism and exposing the country to danger. It works the same way in any country."
FDR had it easy in that he had someone (and a very foolish someone) who was actually able and willing to attack us. Ah, the good old days.
FDR's platform was to remain isolationist, however as time went on it was increasingly obvious the US could not remain so as the Allies were beng dominated by the Axis throughout Europe and Japan had controlled much of Asia for years by 1942. In order to provoke Japan, the US (iirc) blocked oil supplies to the Home islands, amongst other things, effectively daring them to throw the first punch that would get the American public onside. Hitting Pearl Harbour (and Darwin in Australia) was an attempt to decimate the US fleet in the Pacific to stymie the effectiveness of the US when they eventually joined (as the Japanese knew was inevitable). and, iirc someone stood up in parliament (Denmark?) in the weeks before the attack and spoke of intelligence of an attack on PH.....