Comparing national performance across two world wars

How did the major powers' strategic and operational performance compare between the two world wars?

Performance varied by level: leadership, alliance choices, and the timing of industrial mobilization often mattered more than isolated tactical quality.

Germany is characterized as a strategic gambler whose risks sometimes paid, while Italy is described as tactically and operationally capable but badly led at the strategic level in the second war. The United States ultimately performed well despite an isolationist policy that could not keep global conflict at a distance. Britain invested strongly in research but entered the Second World War with aircraft, ship, and vehicle production still short of the scale it would reach two years later. A later exchange distinguishes honoring the guarantee to Poland from being able to rescue it after invasion: the Western Allies could not readily reach Poland, while resistance to the remilitarisation of the Rhineland may have offered greater leverage earlier.