WW2 was a must if one sees the economic side of it. It would only have changed a bit concerning the war parties and the outcome maybe. Will go into it later if I have more time.
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Here we go! Irrespective of the lost WW1 the economy of Germany grow again. It was a similar situation to the Euro-Zone today. Germany "made an own" trade circuit to get independent from France, UK and USA circuit. That was a no go for the just mentioned. I remind only on "Buy British" and "Made in Germany" as an example. Further there was the economy partition of the world between IG Farben (Germany) and Rockefeller and similar (USA). They tried to outmaneuver each other and to gain a foot into the "door" of the business of the other. Ever thougt about why BOSS made the uniforms for Wehrmacht and SS and continued during war to deliver them? Or why General Motors delivered to Germany during war? And why german companies (I think Rheinmetall was one of them) delivered weapons and parts of them to USA? If I remember right even the canon of the T-34/76 was a german product. What I mean is the business went on during war.
But back to topic! This economic battling plus the shame for losing a war even if the common Landser didn´t felt as one had lost led to an unavoidable conflict.
That were the "bosses" and so on who betrayed the Landsers. One wanted revenge therefor. Even more as the Treatment of Versaille was more as unfair. So it was relatively easy to push the people to a new war. Of course that may not be too obvious. So the economy bosses bought them a Führer and other leaders of other nations - depended on on what economy side one was.
Russia wanted similar to Germany to show it was a serious opponent. Sadly during WW1 the russian Octobre Revolution came across. The weakening of the young Soviet Union made Poland and a few other nations thinking they could rip some pieces out of the union.
Poland was very aggressive around this time and dictator Pilsudski was eager to gain more - he looked not only to Germany´s sphere of influence. One could continue that for a long time. But to say it short: Almost every nation in Europe had reasons to start a war.
Now to the actual answer! Considered all that, what I could only touch in the segments above, there was only a marginal possibility - one could say an almost not existent chance - to avoid a war. All the more no one of the warmongers dealt honestly. So the common people were taken by loyalty, honour, love for the Fatherland and what not all. All the fine values what became only empty words. The Treatment of Versaille was only a reaction accelerator. If it wouldn´t have been called into life something other had overtaken to work as spark on the fuse.
If France and Britain had made their peace with Germany Hitler wouldn´t have had the problem with a two-frontiers-war. In worst case Poland would still have been a foe and Hitler had it occupied without Russia. In best case via relationship to France and UK Poland would have been a partner. Russia would have been the opponent in every case since communism and the might of the workers were and are a threat for the capitalism. Russia would have been invaded with or without the USA. But if that would have been the case Russia would have struck first since Stalin was since long on the way to carry the communism till to the Atlantic Ocean. And in reality he was almost ready to strike as german troops entered Russia. France and UK weren´t able to react immediately - at least that is the official statement - since they needed further time to get ready for war. One can imagine what would have happened if Russia was the opponent and not Germany.
My personal opinion about that topic is that Germany was chosen again as bad guy. One thought it easy to control and to beat again if necessary after it was just beaten and all "allies" had worked together very well. So in the background the warmongers (who give a damn on nationality) conspired to do another "good deal/business". If another country had lost the war that mentioned country would have been the new bad guy for WW2.
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