There is a scenario that i thought up while daydreaming in court one day... waiting for jury selection is so awful boring i take a book or small pen and pad to pass the time.... Anyways here it is:
What if Hitler had called a temporary cease fire after the Fall fo France to sit down for talks with Great Britain about an end to the war at that point? I imagined Hitler one one side of the table with Russia as a 'neutral' ally on their side of the table. Across from him would be Great Britain with the U.S. as their neutral ally.
Hitler would have the option to resume the war if negotiations went badly - the time spent in the talks would allow Germany to gather stocks, continue to train troops, build more war machines, gather intel, and allow the troops some rest so that they would be fresh for any battle that might follow.
The object of the talks: the retention of the Germanic lands that had been overrun in the Blitzkrieg in return for the return of the French government to power and the return of the greater portion of France and affected European smaller nations. And also the reversal of the ridiculous penalties given to Germany with the Versailles Treaty, of course.
If Hitler approached the table as the diplomat and the Western allies completely rejected any attempts at diplomacy at that point i wonder if the opinion of the American public would have been so strong should the hostilities resume - since they would be then blamed on the British, painting Hitler as the one whom had attempted a diplomatic solution.
The world may have turned out to be a different place.