alternatehistory.com

OTL, the "Long War", the period from 1942 to 1997 (when a peace treaty was finally signed between Britain, France, and Germany and the two French government reunified) in which the United Kingdom, Greater German Reich, and Soviet Union struggled in a three way global geopolitical struggle, is actually somewhat surprising considering the attitudes Hitler and Churchill had before they went kaput.

Hitler OTL had plans to invade the Soviet Union following the fall of France, but by the time the French Government was driven to Algeria in early-1941 the war in the west had drained the German economy and war machine to the point that an eastern war was unfeasible. After Beppo Romer took out Hitler in 1942, Goerring was more interested in consolidating Europe than starting a war in the east. Britain and Free France meanwhile agreed to a temporary (55 year long) ceasefire following the liberation of Norway.

What if rather than 55 years of simmering conflict there had been a second Great War?
Top