Canada has never fought a direct war against the United States. However, before confederation (1867) when Canada became a self-governing dominion, the territories that would later form that dominion, which had been under the control of the British, engaged in a small number of military conflicts with the United States (or as they were known previously, the Thirteen American Colonies). The total is four, if we only count significant engagements which involved organized forces. Economic wars, or trade disputes, are another story. We’ll get there.
The Aroostook War (1838–1839) drew no blood. The conflict concerned the Maine-New Brunswick border and was resolved amicably by the Webster-Ashburton Treaty of 1842. A quarter of a century later the Fenian Raids (1866–1871) saw the Irish-American Fenian Brotherhood make multiple non-state sanctioned attacks in British North America in an effort to sway Britain to withdraw forces from Ireland.
The other far more consequential military struggles between the two North American friends and neighbours occurred first in the late eighteenth century, and second in the early nineteenth century. During the American Revolutionary War (1775-1783), which saw limited involvement of areas north of the 49th parallel, British North America thwarted a particularly serious invasion by the Americans in 1775 known as The Battle of Quebec.
It was fought during a snowstorm on December 31, 1775 (one of few battles fought in such miserable conditions during the revolutionary war). The American intention was to conscript the British colony, which today forms the province of Quebec (and also included parts of Ontario) into their struggle against the British. The Patriots of the Thirteen Colonies had earlier that year begun rebelling against British taxation and governance. They surmised that the French-speaking Quebec settlers, disaffected with the imposition of British rule as it was laid out in the 1763 Treaty of Paris (which ended the Seven Years War), would join the American cause. A significant miscalculation, to say the least.
The battle was fought on two fronts against a British garrison of 1800 soldiers led by British commander, Governor Guy Carleton. The combined total of American troops was only 1200. The first front was commanded by Brigadier General Richard Montgomery, who led his troops in an attack of the Lower Town from the south. The second assault occurred from the north and was led by Colonel Benedict Arnold (who would later become an infamous American traitor).
Montgomery and several officers were killed instantly on their initial advance. This sparked a retreat amongst his remaining soldiers. Arnold had slightly more luck. His army penetrated northern defences but were stymied in the narrow streets of Quebec. During fighting Arnold was wounded, after which he handed the command to Daniel Morgan. After hours of fighting, Morgan and his men were forced to surrender. The Americans lost the battle decisively ensuring Quebec would remain a loyalist stronghold.
The second of the two significant conflicts involving British North America and the Thirteen American Colonies was the infamous War of 1812 – a more well-known period of antagonism between proto-Canada and her American neighbours.
Here is a topline summary with some extra history concerning the U.S.-Canada border (the world’s longest undefended border), from Terry Glavin:
The War of 1812 — which the Americans still pretend they won — was officially concluded with the Treaty of Ghent in 1814. Then came the Rush-Bagot Pact of 1817 and the Convention of 1818, which set the border at the 49th parallel.1
The War of 1812 took place during Britain’s struggle against Napoleonic France. The two most famous Canadian battles from this tragic conflict were the Battle of Queenston Heights and the burning of York (now Toronto) – British troops would even the score of the latter by burning Washington D.C.
The war was unpopular. Like today, there were too many bonds between the Americans and proto-Canadians. But also like today, with Canada and the United States once again bickering over trade and various political interests, the disagreements were accompanied by a reluctance to engage in hostilities.
From Pierre Burton’s War of 1812:
At the outset, it was a gentleman’s war. Officers on opposing sides met for parlays under flags of truce, offered hospitality, exchanged cordialities, murmured the hopes that hostilities would quickly end.2
No matter what time period we are examining, we can never forget that Britons, Canadians and Americans are all first cousins. Yes we disagree from time to time, sometimes we even fight. But always over some unfortunate political dispute, and never for each other’s annihilation.
In 1812, for a variety of reasons, the Americans, especially a minority of hawkish elites in Washington, felt they had no other choice but to invade the north. Some of them felt it would be easy. An aggravating factor concerned Britain’s support of Indian tribes in the north west, at a time when the Americans were aggressively expanding into that region. But also, during their imperial contest with France, the British were impressing sailors in the American navy (forcing them to join British forces), because they considered them traitors of the British crown. Further, they blocked key trade ports under Napoleon’s control, disrupting trade between America and France.
Isn’t it curious how trade so often appears as the rift in Canadian-American relations? Further examples include: the Reciprocity Treaty of 1854 which allowed for free trade of natural resources between the American and British colonies. However, the Americans abrogated that treaty in 1866 partly out of frustration at perceived British support of the confederacy after the Civil War. A post-confederation trade war with the Americans ensued after Canada’s first Prime Minister John A. MacDonald adopted the National Policy in 1879, which imposed high tariffs to protect Canadian industry. Triggering the Americans to respond with tariffs of their own.
James Pew, “Canadians and our ties to Americans”, Woke Watch Canada, 2025-03-30.
