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This thread is not about How or how plausible war plan red ( the invasion of Canada by the US army is) this is about what would happen IF it did happen and who would win? The USA would quickly overrun the border and occupy key rail hubs- but they would have been delayed by heavy resistance the sheer vastness of Canada- enabling the British empire to send forces across. The British would then begin a blockaid against The US coast and destroy there fleet, while enticing other euriopian nations to join them ( possible even a Anglo, French Nazi alliance?) or Nazi Germany or the soviets would use it as an opportunity to strike! However- the US fleet was large and it's possible they could severely damage or defeat the British fleet- severing British trade routs.
But what do you think would have happend? Would a blockade work? Would the British invade the US, would canada be ceded? And who would win in the long run?