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One thing that always had me scratching my head about the Maginot Line (before learning about the construction costs) was why the French didn't extend the thing to cover the Belgian border. Considering that was the route the Germans invaded in WWI it always struck me as a huge oversight the main invasion route was effectively uncovered.
What if the French threw sufficient resources at the Line to extend it that far north? What impact does this have when the Nazis go west?