Can you give me an idea on why USA, Italy, France, Japan, USSR wouldn't have
played a significant role in those developements.
Maybe I do not understand your point of view, but, what about the Schneider
cup ? Just an example.
Another one : the P51 really became brilliant when fitted with the Merlin
engine, but the airframe was already excellent.
The Hispano engine (and guns) became really efficient later in the war (with
russian developement for the engine and british for the gun).
So ?

Regards
Yann

Is this a World War II newsgroup or what?

Why can't anyone talk about at least modern military aviation?

The originators of the most of the modern military aviation developments
are
Germans and Brits,thats the reason why their names comes up frequently
during
discussions.