Canadian Prime Minister Mark Carney has acknowledged that he personally considered the possibility of American military action against Canada, and that the Canadian Armed Forces examined potential responses to such a scenario. Though regarded as extraordinarily unlikely, the contingency falls into what security analysts call a "black swan" event — a low-probability but high-consequence development that prudent governments plan for regardless of its perceived remoteness. Canada has historical precedent for such planning, including the interwar-era Defence Scheme No. 1, which similarly modelled conflict with the United States, underscoring the longstanding principle that preparation for even improbable threats strengthens institutional readiness and strategic thinking.