At the time of theAmerican Civil War (1861–1865),Canada did not yet exist as a federated nation. Instead,British North America consisted of theProvince of Canada (parts of modernsouthern Ontario and southernQuebec) and the separate colonies ofNewfoundland,New Brunswick,Prince Edward Island,Nova Scotia,British Columbia andVancouver Island, as well as a crown territory administered by theHudson's Bay Company calledRupert's Land.Britain and its colonies were officially neutral for the duration of the war. Despite this, tensions between Britain and theUnited States were high due to incidents such as the Trent Affair,blockade runners loaded with British arms supplies bound for theConfederacy, and theConfederate Navy commissioning of theCSSAlabama from Britain.[1]
Canadians were largely opposed toslavery, and Canada had recently become the terminus of theUnderground Railroad. Close economic and cultural links across the long border, also encouraged Canadian sympathy towards theUnion. Yet relations were not all good with the US. Secretary of StateWilliam H. Seward, while campaigning on behalf of presidential candidateAbraham Lincoln, made no secret of their desire to annex Canada. Seward believed inmanifest destiny, the doctrine that the United States would inevitably expand across the entire North American continent. While he seems to have preferred to acquire territory through negotiation rather than aggression, Canadians were not wholly assured of America's peaceful intentions, and indeed Seward proposed an invasion of Canada, but Lincoln declared he would fight only one war at a time.[2] Between 33,000 and 55,000 men from British North America enlisted in the war, almost all of them fighting for Union forces. Some press and churches in Canada supported the secession, and some others did not.[3] There was talk inLondon in 1861–1862 of mediating the war or recognizing the Confederacy.Washington warned this meant war, and London feared Canada would quickly be seized by theUnion army.[4]
In November 1861 tensions escalated between Washington and London when an American warship stopped the British mail shipRMS Trent on the high seas and seized two Confederate diplomats,James Mason andJohn Slidell. London demanded their return and an apology, and to signal its intention to defend its possessions sent 14,000 combat troops to Canada and the Maritimes, while the Canadians planned to raise 40,000 militia. PresidentAbraham Lincoln defused the crisis by releasing the diplomats, though he did not issue an apology. He cautioned his Secretary of StateWilliam H. Seward, "One war at a time." The British decided that unification of the North American colonies was now a high priority, as a new strong dominion would relieve London of the need to station large British forces to defend British North America.[5]
Rising concerns over the security of railways in Canada while the Civil War raged in the United States led to the 1862 creation of theGrand Trunk Railway Brigade. This unit of Canadian Volunteer Militia recruited amongst railway employees had infantry and artillery companies deployed along the railway lines inCanada East andCanada West.
Confederate operators secretly used Canada and particularlythe Maritimes as a base against the North, in violation of British neutrality. The Maritimes' struggle to maintain their independence from Canada led some Maritimers to be sympathetic to the South's desire to maintain its independence from the North. For example, Halifax merchantBenjamin Wier (1805–1868) acted as Halifax agent for many of theConfederate blockade runners carrying British arms during the Civil War. In return for ship repair facilities in Halifax, the Confederates supplied him with valuable cotton for re-export to Britain, a lucrative but hazardous course for Wier which required severing his business connections with New England. Halifax's role inarms trafficking for the South was so noticeable that theAcadian Recorder in 1864 described the city's effort as a "mercenary aid to a fratricidal war, which, without outside intervention, would have long ago ended."[6]U.S. Secretary of State Seward complained on March 14, 1865:
Halifax has been for more than one year, and yet is, a naval station for vessels which, running the blockade, furnish supplies and munitions of war to our enemy, and it has been made a rendezvous for those piratical cruisers which come out fromLiverpool andGlasgow, to destroy our commerce on the high seas, and even to carry war into the ports of the United States. Halifax is a postal and despatch station in the correspondence between the rebels at Richmond and their emissaries in Europe. Halifax merchants are known to have surreptitiously imported provisions, arms, and ammunition from our seaports, and then transshipped them to the rebels. The governor of Nova Scotia has been neutral, just, and friendly; so were the judges of the province who presided on thetrial of the Chesapeake. But then it is understood that, on the other hand, merchant shippers of Halifax, and many of the people of Halifax, are willing agents and abettors of the enemies of the United States, and their hostility has proved not merely offensive but deeply injurious.[7]
Confederate Secret Service agents operating in Canada were considerable enough to be widely tolerated.[8] For example, inToronto,
Southern agents operated freely and openly with little to no concern from local authorities who were governed by British North America’s official policy of neutrality. Indeed, Southerners enjoyed the sympathy of most of Toronto’s political, social, and business elite—although few were as enthusiastic in supporting the Confederate cause asGeorge Taylor Denison III.[9]
Canadian banks funded their activities and Toronto,Montreal,St. Catharines, and Halifax were among the centers of well-financed Confederate networks by Confederate agents and sympathizers in these cities.[8][9][10][11][12] Several Canadian hotels across the territory, including theQueen's Hotel, Toronto andSt. Louis hotel in Quebec City, acted as informal headquarters for Confederate Secret Service activities.[9][13][8]
On 7 December 1863, while the new Union tugChesapeake was preparing for service in theSouth Atlantic Blockading Squadron, 17 Canadians disguised as passengers seized it offCape Cod, Massachusetts. Word of the takeover reached Portland on the morning of 9 December and quickly spread from there. The news prompted federal officials at northern ports along the coast to speedy action.
On 17 December, the recently captured blockade runnerElla and Annie — which had been hastily manned, armed and sent to sea — caught up with theChesapeake atSambro, Nova Scotia. Shortly thereafter, the Northern gunboatDacotah arrived on the scene; and its commanding officer preventedElla and Annie from taking the recaptured tug back to Boston, lest such action seriously undermine British–U.S. relations. Instead, to observe diplomatic protocols, he escortedChesapeake toHalifax where he asked the colonial Admiralty court to restore it to its owner. The court ruled the Confederate attack was illegal and returned SSChesapeake to its Union owners but the Confederate sympathizers escaped with the help of some Haligonians, creating tensions that received international attention.
On 18 August 1864, the Confederate States ShipTallahassee under the command ofJohn Taylor Wood sailed into Halifax harbour for supplies, coal and to make repairs to its mainmast. Wood could only stay 48 hours under neutrality laws and began loading coal atWoodside, on theDartmouth shore. Union shipsNansemont andHuron were making their way toward Halifax when Wood slipped out of the harbor at 9 p.m. on 19 August. It is believed he departed by the seldom-used Eastern Passage betweenMcNabs Island and the Dartmouth shore to avoid Union warships in case they had arrived. The channel was narrow and crooked with a shallow tide, so Wood hired a local pilot, Jock Flemming. All the lights were out, but the residents on the Eastern Passage mainland could see the dark hull moving through the water, successfully evading capture.[14]
The most-controversial incident was theSt. Albans Raid. Montreal was used as the secret base for a team of Confederates attempting to launch covert and intelligence operations from Canada against the United States. To finance their cause in October 1864, they robbed three banks inSt. Albans, Vermont, killed an American citizen, and escaped with US$170,000. They were pursued across the Canada–U.S. border by Union forces, creating an international incident. The Canadians then arrested the Confederate raiders, but the judge ruled the raid was an authorized Confederate government operation, not a felony, which would have permitted extradition via theWebster–Ashburton Treaty.[15]
Many Americans falsely suspected that the Canadian government knew of the raid ahead of time. There was widespread anger when the raiders were released by a local court in Canada.[16] U.S. Secretary of State William H. Seward let the British government know, "it is impossible to consider those proceedings as either legal, just or friendly towards the United States."[17]

The best recent estimates are that between 33,000 and 55,000 men fromBritish North America (BNA) served in the Union army, and a few hundred in the Confederate army. Many of them already lived in the United States and were joined by volunteers signed up in Canada by Union recruiters.[18] About 2,500 of those British North Americans were Black, with most serving in the US Army and a few hundred in the navy.[19]
Canada refused to return about 15,000 American deserters and draft dodgers.[20]
Calixa Lavallée was a French-Canadian musician and Union officer during the American Civil War who later composed the music for "O Canada", which officially became the national anthem of Canada in 1980. In 1857, he moved to the United States and lived in Rhode Island where he enlisted in the 4th Rhode Island Volunteers of the Union army during the American Civil War, attaining the rank of lieutenant.
Canadian-bornEdward P. Doherty was aUnion Army officer who formed and led the detachment of Union soldiers that captured and killedJohn Wilkes Booth, the assassin of Lincoln, in a Virginia barn on April 26, 1865, 12 days after Lincoln was fatally shot.
Canadian-bornSarah Emma Edmonds was a noted Union spy.
One of the longest-living Canadians to have fought in the American Civil War wasJames Beach Moore, who died on August 29, 1931.
Anderson Ruffin Abbott was a Toronto-born son offree people of color who had fledAlabama after their store was ransacked. Canada's first Black physician, he applied for a commission as an assistantsurgeon in the Union Army in February 1863, but his offer was evidently not accepted. That April, he applied to be a "medical cadet" in theUnited States Colored Troops, but was finally accepted as a civilian surgeon under contract. He served inWashington, D.C., from June 1863 to August 1865, first at the Contraband Hospital which became Freedmen's Hospital. He then went to a hospital in Arlington, Virginia. Receiving numerous commendations and becoming popular in Washington society, Abbott was one of only 13 black surgeons to serve in the Civil War, a fact that fostered a friendly relationship between him and the president.[21] On the night of Lincoln's assassination, Abbott accompanied Elizabeth Keckley to thePetersen House and returned to his lodgings that evening. After Lincoln's death, Mary Todd Lincoln presented Abbott with the plaid shawl that Lincoln had worn tohis 1861 inauguration.[22][23]
At least 29 Canadian-born men were awarded theMedal of Honor.[24]
The Civil War period was one of booming economic growth for the BNA colonies. The war in the United States created a huge market for Canada's agricultural and manufactured goods, most of which went to the Union. Maritime shipbuilders and owners prospered in the wartime trade boom.
The American Civil War had decisive political effects on the BNA colonies. The tensions between the United States and Britain, which had been ignited by the war and made worse by theFenian raids, led to concern for the security and independence of the colonies, helping to consolidate momentum for theconfederation of the colonies in 1867.[25]
In this regard, the conflict also had an important effect on discussions concerning the nature of the emerging federation. ManyFathers of Confederation concluded that the secessionist war was caused by too much power being given to the states, and thus resolved to create a morecentralized federation.[25] It was also believed that too much democracy was a contributing factor and the Canadian system was thus equipped with checks and balances such as the appointedSenate and powers of the British appointedGovernor General. The guiding principles of the legislation which created Canada – theBritish North America Act – werepeace, order, and good government. This was a collectivist antithesis to American individualism that became central to Canadian identity.[26]
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