Would French anti-aircraft weapons be standardized on American equipment?
Short answerNot initially; Britain was already fighting and supplying other exile fleets, while American entry was too late to shape the first conversions.
NotesInitial standardization would probably favor British weapons because the work would begin in late 1940 or early 1941. The scenario does not itself change the timing of American entry into the war. American participation begins in December 1941, with a substantial effect on armament fitting expected in 1942. The French would therefore probably follow the Dutch and other exile forces in using British light weapons.