History Shows: Attempts to Annex Canada are Doomed
Multiple attempts to annex Canada—whether through war, private militias, or political pressure—have all failed. From the War of 1812 to the Fenian Raids, Canadians have defended their sovereignty.

by John C. Carter for the Bruce County Historical Society
You’ve heard President Trump calling for annexing Canada as the 51st state. As a historian, I can tell you that any such attempt is doomed to fail. Over and over, Canadians have driven off American invaders.
For starters, take the War of 1812. It began in July 1812 when an American army crossed the Detroit River and occupied Sandwich (Windsor), only to abandon it and return to Detroit when supply lines were cut off by Tecumseh and his alliance of First Nations warriors.
It was the first of many incursions into Canadian territory. The United States launched these invasions based on long-standing differences with Great Britain, such as trade restrictions and the impressment of sailors. Underlying these reasons was its desire to expand in North America, in fact, to annex some or all of Canada (then Upper Canada and Lower Canada).
For over two years, the hostilities continued. There was the Battle of the Thames, where Tecumseh was killed; the attack across the Niagara River and the defeat at Queenston Heights; the burning of York (Toronto); and Laura Secord’s 20-mile trek through enemy lines to warn the British of an impending American attack.
When the smoke cleared and a peace treaty was signed, over two years of war had yielded no change—the U.S. failed to annex one square inch of Canadian soil.
The following years saw more invasions, only this time, the aggressors were a private group not sanctioned by the government. The “Patriots” were groups of armed men on both sides of the border seeking to overthrow British rule in Upper Canada and set up a republican government. They believed Canadians would join them, but in fact, much of the Canadian population was loyal to British institutions and decidedly against overthrowing them.
During the Patriot War, at least 19 armed incursions from the U.S. into Upper Canada were recorded between December 1837 and December 1838.
For example, William Lyon Mackenzie and a group of armed men occupied Navy Island in the Niagara River in December 1837 and declared the island the Republic of Canada. Up to 500 volunteers joined them, to no avail. A heavy bombardment by the British persuaded the invaders to retreat to Buffalo, where they were captured by the U.S. Army.
Again, in January 1838, the Patriots shelled Fort Malden and Amherstburg from the schooner Anne. After she grounded, Canadian militia opened fire and captured the vessel and crew. Then, in February, Patriots from Navy Island and Ohio occupied and held Pelee Island until they were driven out by British and Canadian forces.
Other losses followed. Not convinced by these defeats, in December, an armed group of Patriot invaders crossed the river from Detroit and took possession of Windsor. Again, they were routed by loyalist forces. This was the last incursion in the Patriot War.
These and other attempts to conquer Canada failed miserably. This brings us to the Fenian raids of 1866 and 1870.

Fenians were a group of Irish-Americans, many of whom were battle-hardened veterans of the Civil War. They invaded Canada, intending to seize territory that they could trade to Britain in exchange for Irish independence.
On June 1, 1866, over 1,000 Fenians crossed the Niagara River and captured Fort Erie but fled to Buffalo at the approach of large numbers of Canadian militia and British soldiers.
Further raids followed, all unsuccessful. 1,000 Fenians marched into Pigeon Hill, Canada East in 1866, but Canadian forces chased them out the next day.
In June 1866, volunteer companies from Bruce and Huron counties rallied to repel an “imminent” attack by Fenians from Chicago. They drilled in Goderich for four weeks, then went home when it was clear the Fenians weren't coming.
Fenians tried again in 1870, crossing the border at Frelighsburg, Quebec, only to be forced back by Canadian forces. Yet another attempt at Huntingdon, Quebec was repulsed quickly.
The Fenian incursions set off a wave of patriotic feeling, uniting the provinces against threatened invasion, and were one of the factors leading to Confederation in 1867.

None of these armed attempts to violate Canadian sovereignty were successful, ending only in defeat for the Americans.
The military defeats didn’t stop inflammatory writers from stirring the pot of annexation. In 1854, you could read about the “Annexation of Canada” in papers like the New York Daily Tribune and Putnam's Monthly Magazine. Their argument was based on their belief in Manifest Destiny, that the United States was morally destined to expand and bring republican government to the whole of North America.
From the 1840s through to Confederation, further attempts to annex Canada surfaced in the form of public meetings, circulation of petitions, threat of trade wars and tariffs, and frequent editorials in border state American newspapers—all to no avail.
Less hostile and more cooperative bilateral initiatives actually bore fruit.
The original Reciprocity Treaty was negotiated, agreed to, and operated between 1854-66. This measure eliminated custom tariffs and resulted in an increase in trade between the two countries.
Similar treaties were replaced in 1948 by the General Agreement on Tariffs and Trade, itself replaced in 1992 by the North American Free Trade Agreement, now in its second iteration.
Other successful joint projects began as early as 1853. In that year, work began in Michigan to build the Soo Locks. They were completed and opened in 1855. The Sault Ste. Marie Canal was built in 1895. Both of these initiatives improved shipping on the Great Lakes. A more modest shipping improvement occurred at the St. Clair Flats, starting in the 1860s. Both nations contributed to work and funding to facilitate a better route between Lake Huron and the Detroit River.
The St. Lawrence Seaway proved to be the largest such joint venture. Construction began in 1954, and the Seaway was opened in 1959.
Cooperation has proved to be of mutual benefit to both Canada and the United States. No annexation was required.
Faced with President Trump and his threats to annex Canada, all I can say is, we’ve seen it all before, and it didn’t work.
All photos and text submitted by Bruce County Historical Society