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In the 1925, French architect Le Corbusier proposed a new plan, known as Plan Voisin, to completely redo Paris, backed by car manufacturer Avions Voisin. The entire area between the Seine and Montmartre would be demolished. Then, 18 60-story skyscrapers would be built, and massive arterial super-highways would be paved over the area.

I know this is near-ASB, but suppose the plan had been implemented. What would it take for the plan to be put into action, and what are some ways history would be affected from then until the present?
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