The War of 1812 analogy cannot carry the whole scenario

The War of 1812 supplies arguments about trade and resistance to blockade, while Manifest Destiny supplies the imagined reward of Canada. Impressment was no longer the grievance it had been in 1812, and later Anglo-American arrangements were intended to prevent another conflict. The scenario therefore requires an American administration to assume that Britain is too occupied in Europe to react, that Canadians will welcome intervention, and that the United States can then concentrate against Japan. Each assumption removes a historical restraint or substitutes an optimistic political calculation. The resulting premise is explicitly described as delusional and highly unlikely.