Extrait de l'article:
(...) war plans in both the United States and the United Kingdom expected a multipronged invasion into America’s northern neighbor, designed to quickly occupy the country before British (...) reinforcement could arrive. (...) Plans for initial attacks included the seizure of Vancouver, Winnipeg, the Niagara Falls area and most of Ontario.
Given the overwhelming disparity between available U.S. and Canadian military forces, most of these offensives would probably have succeeded in short order. The major battle would have revolved around British and Canadian efforts to hold Nova Scotia, New Brunswick and especially the port of Halifax, which would have served both as the primary portal for British troops and as the main local base for the Royal Navy. U.S. military planners understood that Halifax was the key to winning the war quickly, and investigated several options (including poison gas and an amphibious assault) for taking the port.
Assuming they held the line, could British and Canadian forces have prevented the severing of supply lines between Halifax and the main cities of Quebec and the Great Lakes region? Unlikely. The U.S. Army would have had major advantages in numbers, logistics, and mobility. Ottawa and Toronto might each have proven too big to swallow and digest quickly, but severing their connection to the Atlantic would have made the question of their eventual surrender only a matter of time.
And what about Quebec? The nationalism of the early twentieth century did not look kindly on large enclaves of ethno-linguistic minorities. Moreover, the United States had no constitutional mechanisms through which it could offer unique concessions to the French speaking majority of the province. In this context, Quebecois leaders might have sought an accord with Washington that resulted in Quebec’s independence in exchange for support for the American war effort, and Washington might plausibly have accepted such an offer. An accord of this nature might also have forestalled French support from their erstwhile British allies. If not, the U.S. Army planned to seize Quebec City through an overland offensive through Vermont.
(...) The new map, then, might have included a United States that extended to the Arctic, an independent Quebec, a rump Canada consisting mostly of the Maritimes and Japanese control of the entirety of the Western Pacific. Tokyo, rather than London or Washington, would have stood as the biggest winner, hegemonic in its own sphere of influence and fully capable of managing international access to China.
L'auteur Harry Turtledove, dont j'ai déjà parlé ici et ici, a imaginé un scénario semblable dans quelques-uns de ses romans.