“With Poland and France as friends of Germany or even allies, what reason would Churchill have had to go on with the war? Could he really motivate the English to fight and free the continent, when the French and Poles found an agreement with Germany? Would the USA had any reason to step in?”:
The reasons for UK to go to war were still valid. The UK didn’t want a strong Continental Power, and that was UK policy for centuries.
Would a “neutralisation” of France by an acceptable Peace Treaty change this? No.
France was as friendlier to Germany as possible thanks to the betraying of Marshal Pétain lead by Laval. The deportation of Jews were done without request of the German, the Collaborationist French Government, after having destroy the Republic, provide Germany with free workers (STO), troops (L.V.F, 33 SS Division and various auxiliaries), and of course, the famous Milice. The Pétinist troops fought against the Allies each time they could (on the orders of Pétain) and, funny enough, if Germany/Hitler would have allow France to keep a Army, that could have change the path of the war (image the French Fleet fighting against the Allies in Mediterranean , reason of Mers El Khebir).
You second point is a wrong question: USA were attacked by Germany, they didn’t step in. Germany attacked the US merchants fleet following the Japanese Attack. So, the USA had no choice in this matter.
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