War Plan Red: The 1930s Blueprint for a US Invasion of Canada
In the archives of military history, a classified strategy from 1930 known as War Plan Red details a hypothetical American invasion of Canada. This plan, devised amid fears of a war with Great Britain, envisioned a swift and brutal assault. American forces would employ poison gas, seize key ports, and cripple infrastructure by destroying bridges and rail lines. The objective was clear: capture major cities along lakes and rivers to suppress civilian resistance, aiming for a quick victory within days.
Trump's Aggressive Stance Rekindles Old Anxieties
Once considered a historical curiosity, War Plan Red has gained new relevance under the Trump administration. The United States is increasingly asserting its dominance in the western hemisphere, with policies that blend economic nationalism with belligerent foreign tactics. In early January, the Trump government ordered the capture of Venezuela's president, Nicolás Maduro, and announced intentions to control the country's oil. Shortly after, officials openly discussed invading Greenland for its strategic and mineral value.
These actions have rattled Canada, especially given Trump's comments about the US-Canada border. He has described it as an "artificially drawn line" that could be redrawn, suggesting a unified continent was "the way it was meant to be." In January, Trump posted an altered image on social media showing the US flag covering Canada, Greenland, and Venezuela, further fueling concerns.
Canadian Vulnerability and Defence Preparations
Experts warn that Canada's geographic and demographic makeup makes it exceptionally vulnerable. Thomas Homer-Dixon, a Canadian conflict researcher at the Cascade Institute, notes that the country has long depended on American friendship, which now appears to be vanishing. A 2025 poll revealed that 43% of Canadians believe a US military attack within five years is at least somewhat likely, with 10% deeming it highly probable.
In response, Canada is bolstering its defences. The military has outlined plans to train federal and provincial employees in skills like firearms handling and drone operation, potentially expanding the supplementary reserve from 4,384 personnel to 300,000. The Cascade Institute has proposed a national service program, costing between C$1.1bn and C$5.2bn, to enhance civil defence capabilities.
Historical Context and Modern Implications
War Plan Red, first devised in 1927 and approved in 1930, was based on American fears of British aggression, with Canada as the likely battleground. US planners acknowledged that if they lost, Canada might demand Alaska. This historical strategy highlights the fragility of political alliances and the persistent threat of American expansionism.
Homer-Dixon suggests that Trump could launch a campaign to demonize Canada, portraying the border as lawless to shift American perceptions. Alternatively, he might exploit secessionist sentiments in Alberta, using a failed referendum as pretext for annexation. Former Canadian officials, like Bob Rae, have called these threats "existential" to Canada's future.
Looking Ahead: Canada's Strategic Response
To counter these risks, Homer-Dixon advocates for Canada to deepen ties with Scandinavian allies and adopt a deterrent strategy: making any potential invasion costly for the aggressor. He emphasizes that decades of economic integration have not eliminated the underlying "might makes right" mentality in US policy, which has resurfaced under Trump.
As tensions simmer, Canadians are grappling with the reality that their neighbour's ambitions could pose a direct threat, reviving fears rooted in a nearly century-old war plan.
