AHC: The War to End All Wars

What if World War I was the first and last (real) World War? What had to happen that World War II will never happen?
To make it real hard, some developments of OTL have to happen. The western society (North America and Europe including Germany!) in TTL should be similiar to its counterpart in OTL.
This should NOT a GermanWank or GermanScrew!
 

MSZ

Banned
Weimar Germany has to survive and liberalise to a degree similiar to OTL Bundesrepublik. Decolonization has too occur due to both military presure (inurgencies in Africa nad Asia) and econimoc realism - free trade must be established as a principle in the world. Liberal Weimar Republic could do all these things, by pressuring the British and French to open theirown and their colonies markets, as well as sell arms to rebels like OTL Soviet Union. Japan would have to lose the war in China and turn to the US due to rising Soviet power, though without the Pacific War and subsequent american occupation it propably wouldn't look like current Japan. A Vietnam-like war could be fought be the US in the Philippines should the US decide to keep it's influence their despite local opposition.
 

BlondieBC

Banned
Nuclear weapons. Without nuclear weapons, the USA and USSR would have fought WW3 over Berlin, Afghanistan or some other issue.

So, we need all major powers to have nukes, so we need all the powers to survive, so we need a stalemate and negotiated peace. So say Wilson successfully negotiates a peace without victory in 1916. Wave Space bat. All size are exhausted by the war, but realize how close each side came to ruin. Germany realized that it likely will not stop the Russian hordes next time, and with the Tsar continuing to industrialize fears a properly equipped Russian Army as part of the Entente. So in the 1930's as German physicist begin to understand the atom, the German General Staff begins its "Berlin Project". By the mid-40's the other major powers start working on the bomb, and by 1949 Germany tests its first nuclear weapon.
 
The PoD should be in World War I, because the OTL results of this war were the reason for World War II. So, the Great War should be much more devastating than in OTL. And, IMO this is possible without the use of nuclear weapons.
 
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