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Here's the idea: somehow avoid major European wars in the 20th century, with a PoD before 1900.
Perhaps there is a major European war in the late 19th century that involves all major powers, which leads to an earlier start of European integration, leading to a sort-of European Union or at least Coal and Steel Community in the 1930s? I know that any war before the advent of modern machine guns, barbed wire and artillery would not make this proto-Great War that bloody, but a long war in the 19th century would be able to cripple European economies enough for them to slowly start to warm up to each other, eventually forming an early EU.