The worse that the world wars can get

For world war one I, starting it in say the 1890's and last for decades, the unrestricted use of biological and chemical weapons, neutral nations picking a side.

For world war II
The entry of various neutral nations through either invasion or force to side with one side or another.
The Western Allies vs Axis that has allied with Nationalist China VS USSR VS Japan
Unrestricted use of Biological and chemical weapons
A war where Nazi Germany's high command and most of its troops retreat into the Alps and make a last stand there
The West and the USSR go into a shooting war immediately, and the USSR only surrenders when the last commissar is killed
Japan does not surrender

What would the casualties be? How long do you think a war like this be?
 
WWI, the French and Russians are knocked out of the war early, and then Britain and Germany literally bleed themselves dry in the Atlantic and the Middle East, and at the end both sides are economically and demographically in ruins. Nobody wins, really.

WW2, the French and Russians are knocked out of the war early, and then Britain/USA and Germany literally bleed themselves dry in the Atlantic and the Middle East, and at the end both sides are economically and demographically in ruins. Nobody wins, really. Except maybe the USA, but in a war that lasts long enough, Germany will deploy supersonic planes to bomb the U.S. eastern seaboard.
 
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