With a POD of 1920, France must have a more inovative military doctrine then Germany, with the Germans sticking to WWI style tactics while France looks into Air Power, concentrated Armor, Mobile Warfare and the like.
And in this POD, France and Germany have to be very similar to OTL politically(EI, German Nazi's, Democratic France, spineless French political figures, war over Poland or Czeckoslovakia).
And in this POD, France and Germany have to be very similar to OTL politically(EI, German Nazi's, Democratic France, spineless French political figures, war over Poland or Czeckoslovakia).