Now the US is vying regional dominance, experts point to War Plan Red as proof its Canadian allyship has always been flimsy

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irst, American forces would strike with poison gas munitions, seizing a strategically valuable port city. Soldiers would sever undersea cables, destroy bridges and rail lines to paralyze infrastructure. Major cities on the shores of lakes and rivers would be captured in order to blunt any civilian resistance.

The multipronged invasion would rely on ground forces, amphibious landing and then mass internments. According to the architects of the plan, the attack would be short-lived and the besieged country would fall within days.

The target was Canada, part of a classified 1930 strategy – War Plan Red – for a hypothetical war with Great Britain where the US would seek to deny it any foothold in North America.