A classified US military plan from 1930 outlining an invasion of Canada has gained renewed attention as President Donald Trump's rhetoric fuels fears of annexation. War Plan Red, devised by American strategists for a hypothetical war with Britain, detailed a multipronged assault using poison gas, amphibious landings, and mass internments to seize Canadian ports, railways, and cities within days.
The plan, once dismissed as a historical quirk, is now cited by experts as evidence of longstanding US ambivalence toward its northern ally. Trump has repeatedly questioned the Canada-US border, calling it an 'artificially drawn line,' and posted an altered map showing the US flag covering Canada, Greenland, and Venezuela. His administration has also pursued aggressive actions against Venezuela and Greenland, stoking Canadian anxiety.
Canadian officials condemned Trump's comments, but the Globe and Mail reported that Canada's military has modelled a hypothetical US invasion, concluding that guerrilla tactics would be necessary. Conflict researcher Thomas Homer-Dixon warned that Canada's geographic vulnerability and historical reliance on US goodwill have left it exposed, saying, 'All of a sudden, both those things have just disappeared.'
War Plan Red, approved in 1930, assumed Canada would fall quickly due to its population concentration near the border. The plan's revival underscores persistent Canadian fears of US aggression, even amid decades of economic integration.
