Canada Joins WWII: Declaring War on Nazi Germany

Canada's Parliament approved a declaration of war against Nazi Germany on September 10, 1939, nine days after the German invasion of Poland, entering World War II as an independent nation for the first time in its history. Unlike in 1914, when Canada had automatically entered the Great War as a consequence of Britain's declaration, Prime Minister Mackenzie King insisted on a separate parliamentary vote to affirm that Canada's participation was a sovereign decision rather than an imperial obligation. The deliberate delay between Britain's declaration on September 3 and Canada's on September 10 was itself the point: a nation of 11 million people was choosing to fight. King had spent the 1930s carefully managing a country divided by language, region, and attitudes toward European wars. French Canadians, concentrated in Quebec, were overwhelmingly opposed to overseas military involvement, remembering the conscription crisis of 1917 that had torn the country apart. English Canadians, particularly those with strong ties to Britain, were generally supportive of the war effort. King navigated this divide by promising that there would be no conscription for overseas service, a promise he would find increasingly difficult to keep as the war progressed. Canada's military contribution to World War II was vastly disproportionate to its population. Over the course of the war, more than one million Canadians served in uniform out of a population of roughly 11.5 million, the highest per-capita mobilization rate of any Western Allied nation. The Royal Canadian Navy grew from a handful of vessels to the third-largest navy in the world, escorting convoys across the Atlantic. Canadian forces fought in the disastrous raid on Dieppe in 1942, the invasion of Sicily and Italy in 1943, and the D-Day landings at Juno Beach on June 6, 1944. The war transformed Canada from a primarily agricultural dominion into an industrial and military power, and the shared sacrifice accelerated the country's emergence as a fully sovereign nation on the world stage. Over 45,000 Canadians died in the conflict. The September 10 vote remains a defining moment in Canadian nationhood, the day the country chose war on its own terms rather than having it thrust upon them by imperial decree.