A false dilemna. Britain could have lost too many pilots to continue the fight. Britain could have suffered more defeats and blunders, prompting Hitler to order an amphibious landing. Britain could have surrendered and been treated like Holland, France, etc. Britain could have failed to declare war in 1939 like certain other countries (U.S. and Russia). Britain could attempted to negotiate an alliance.The willingness to fight to the death is admirable, but you'd do that anyway if you knew that the alternative was getting dominated and having your people slaughtered.
And logistics are meaningless without the people to fight. You focus on resources yet neglect *personnel* and skill as a resource.And that willingness means nothing if you don't have the logistics to back you up.
I take it the question is: what was the deciding factor in Germany's defeat. The "deciding factor" is not "deciding decision". The "deciding factor" is the "factor that decides". A factor doesn't have to be a choice, it can be a fact, hence factor. It is the fact of U.S. military superiority that would be the descisive factor in any war against Iraq (for example).The point really comes down to what's the deciding factor, if one factor has already been decided, (i.e. the willingness to fight and die) then it is moot when it comes down to deciding what the key factor in winning the war is.
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That is the whole point, the original question is flawed because it assumed everyone involved had a choice. But that is false, the Russians and the Brits didn't have a choice, they were the targets of aggression, (specifically the Russians).
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I am pointing to a single factor that turned the war in the favor of the allies
IMHO The Russian campaign is the deciding factor, which caused the greated casualties to Germany, and is primarily the result of superior Russian numbers in personnel and T-34 tanks.
I could argue that the U.S. had no choice but to support Britain if it wanted to keep its own position as a world power. That it had no choice but to declare war against Japan in 1942, and Germany had no choice to declare war against the U.S. in response.... but that doesn't belittle the important U.S. contribution.