Challenge: First global war is fought with WWII-era technology

What if the first world war doesn't happen until humanity has the conventional weapons that were used in WWII? Atomics optional.

There could be smaller, clearly regional, non-world-changing wars that happen prior to it, to accelerate the development of weapons.
 
Was it possible to postpone Great War ? Yes, easy, do not get Franz Ferdinand killed. Get Luddendorf fired. Then avoid franco-british carving up of Ottoman empire. There is no communism, no Soviet Union, so there is no Red scare, making it easier for left to get to power.
If Great Depression still happens, it could lead into war in early 1930`s.
 
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