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Lets imagine that the battle of 1683 outside Vienna had resulted in most of South Eastern Europe becoming Muslim majority countries and over the following decades and centuries that Islam became the second largest religion in Europe. This culminating in many migrant workers from Muslim South Eastern Europe come to Northern Europe in the mid and late 1800s.
What if this in turn changed the later Nazi Party's enemy from Jews to Muslims? Which resulted in Hitler's Reich goes after a potentiel large Muslim minority in Germany and later sends his army on a rampage through South Eastern Europe viewing himself as a cruisader and wanting to use the German Army to liberate the Holyland. Maybe only fighting a limited war against France. How could such butterfly events have changed World War 2? How would the West have defeated Hitler in this Univers? and saved millions of Muslims from the madness of the Nazis?