iOTL, between 1939 and 1945, six of the seven nations with the largest GDP (UK, FR, DE, SU, IT, JP, US) had their industrial plant damaged or destroyed by World War II, leaving the US with its more or less undamaged industrial plant largely unrivaled.
So with a POD after January 1, 1936 have the USA *more* dominant on the planet on January 1, 1946 than OTL. (If this involves nukes going off in Europe, give some explanation of why...)
So with a POD after January 1, 1936 have the USA *more* dominant on the planet on January 1, 1946 than OTL. (If this involves nukes going off in Europe, give some explanation of why...)