well Europe and a lot of the rest of the world had been in flames for over a year so it didn't need a genius to see what was might happen
Tho"
Roosevelt, acutely aware of strong isolationist and non-interventionistsentiment, promised there would be no involvement in foreign wars if he were re-elected." so there was pressure to keep the head firmly in the sand though the campaign,
They clearly started preparation before the actual election date in Nov 1940 with the draft law in September 1940 but it took almost another year before they started those military exercises