When I study history, I am alert to unique and interesting patterns that add new and sometimes hidden dimension to the story.
WW2 was a continuation of WW1.
Hitler's Third Reich was a continuation of the First Reich which was the Holy Roman Empire and the Second Reich which was the German monarchy that ended when revolutionaries deposed Kaiser Wilhelm II in 1918.
Ironically, democrat and bolshevik revolutionaries destroyed both Tsar Nicholas and Kaiser Wilhelm... and an alliance between western democrats and eastern bolsheviks destroyed Adolf Hitler.