User blog comment:Duchland/The Two Great Wars in one?/@comment-1777104-20100729153718

I'd say perhaps a war beginning in 1930, as a result of the worldwide depression. Perhaps the first world war never happened, or was a regional dispute which Germany wins and continues as republic. The best POD would probably be no assassination of Duke Ferdinand in 1914. The empires of Europe would continue on, bad blood and all, until things get absolutely two hot.

But a protracted war, with no defeat of Germany, sets up a situation which probably would not work. Perhaps if the five years of WW 2 somehow come at the end of WW 1, making a world at war from 1914 to 1923, that would be workable.