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The American Civil War (1861–65) was fought between the northern (Union) states and the southern (Confederate) states, which withdrew from the United States in 1860–61. The war left cities in ruins, shattered families and took the lives of an estimated 750,000 Americans. The war also involved those living in what is now Canada, including roughly 40,000 who joined the fight. The war played a significant role in how and when Canada became an independent country.

John George Diefenbaker, prime minister 1957–63, lawyer, politician (born 18 September 1895 in Neustadt, ON; died 16 August 1979 in Ottawa, ON).

The War of 1812 was fought between Britain and the United States between 1812 and 1814. The war ended in a stalemate but had many lasting effects in Canada. It guaranteed Canada’s independence from the United States. It also gave Canadians their first experience working together as a community and helped develop a sense of nationhood.

(This article is a plain-language summary of the War of 1812. If you are interested in reading about this topic in more depth, please see our full-length entry War of 1812.)

The term Manifest Destiny was first used in 1845 by New York City journalist John Louis O’Sullivan. He used the term in the context of America’s annexation of the Republic of Texas. Manifest Destiny represented the idea that it was America’s right — its destiny, in fact — to expand across all of North America. Politicians and citizens in the United States called for the US to expand by claiming control of British territory. This included the Province of Canada (formerly Upper Canada and Lower Canada), New Brunswick and Nova Scotia.

Fake news is falsified information created with the intent of misleading people. It aims to shape public opinion by eliciting an emotional and biased response that is divorced from facts but in alignment with a particular ideology or perspective. Fake news can effectively weaponize information. It uses disinformation, misinformation or mal-information to demonize or damage a political foe, or to sow confusion and mistrust among the public. Fake news came to the fore of public consciousness during and immediately after the 2016 US presidential election, though its origins date back much further.

Douglas Jung, CM, OBC, politician, lawyer, soldier (born 25 February 1924 in Victoria, BC; died 4 January 2002 in Vancouver, BC). Douglas Jung was a member of Force 136, a group of Chinese Canadian soldiers who fought behind enemy lines in the Pacific theatre during the Second World War. After the war, Jung became a lawyer in British Columbia and was the first Chinese Canadian lawyer to appear before the BC Court of Appeal in 1955. On 10 June 1957, Douglas Jung was elected as the first Chinese Canadian member of Parliament.

The War of 1812 (which lasted from 1812 to 1814) was a military conflict between the United States and Great Britain. As a colony of Great Britain, Canada was swept up in the War of 1812 and was invaded several times by the Americans. The war was fought in Upper Canada, Lower Canada, on the Great Lakes and the Atlantic, and in the United States. The peace treaty of Ghent (1814), which ended the war, largely returned the status quo. However, in Canada, the war contributed to a growing sense of national identity, including the idea that civilian soldiers were largely responsible for repelling the American invaders. In contrast, the First Nations allies of the British and Canadian cause suffered much because of the war; not only had they lost many warriors (including the great Tecumseh), they also lost any hope of halting American expansion in the west, and their contributions were quickly forgotten by their British and Canadian allies (seeFirst Nations and Métis Peoples in the War of 1812).

The North American Defence Agreement was a 1957 pact that placed under joint command the air forces of Canada and the United States. Its name was later changed to the North American Aerospace Defence Command.

The Korean War began 25 June 1950, when North Korean armed forces invaded South Korea. The war’s combat phase lasted until an armistice was signed 27 July 1953. As part of a United Nations (UN) force consisting of 16 countries, 26,791 Canadian military personnel served in the Korean War, during both the combat phase and as peacekeepers afterward. The last Canadian soldiers left Korea in 1957. After the two world wars, Korea remains Canada’s third-bloodiest overseas conflict, taking the lives of 516 Canadians and wounding more than 1,200. The two Koreas remain technically at war today.

The Cuban Missile Crisis lasted from 16 to 28 October 1962. The Soviet Union stationed nuclear missiles in Cuba, which posed a threat to the United States and Canada. It brought the world to the edge of nuclear war. Canadian armed forces were placed on heightened alert. Prime Minister John Diefenbaker’s hesitant response to the crisis soured already tense relations between Canada and the US and led to the downfall of his government in 1963.   

The Avro Canada CF-105 Arrow (the Arrow) was a supersonic interceptor jet aircraft designed and built in the 1950s by A.V. Roe Canada (Avro). The Arrow was one of the most advanced aircraft of its era, helping to establish Canada as a world leader in scientific research and development.

Though the Arrow was widely praised for its power and beauty, the program was cancelled in February 1959 by the government of Prime Minister John Diefenbaker. This resulted in the loss of at least 25,000 direct and indirect jobs.

Many believe that the Arrow’s cancellation was a betrayal of Canada’s aerospace industry. Others assert that the jet was extravagant and had little chance of competing with impending innovations. At best, Avro and the Arrow were historic examples of Canadian ingenuity and intriguing case studies of unrealized potential.

The CF-100 Canuck, manufactured by A.V. Roe Canada (Avro), was the first jet fighter designed and built entirely in Canada. It flew in front-line air defence from 1953 until the early 1960s.

 The Seven Years’ War (1756–63) was the first global war. In North America, Britain and France fought each other with the help of Indigenous allies. At the end of the war, France gave Canada (Quebec) and Ile Royale (Cape Breton) to Britain, among other territories. This is the reason that Canada has a British monarch but three founding peoples — French, British and Indigenous.

(This article is a plain-language summary of the Seven Years’ War. If you are interested in reading about this topic in more depth, please see our full-length entry Seven Years’ War.)

The Battle of Queenston Heights was fought during the War of 1812 on 13 October 1812. One of the most famous battles of the war, the Battle of Queenston Heights was the struggle for a portion of the Niagara escarpment overlooking Queenston, where more than 1,000 American soldiers crossed into Upper Canada. Part of the American force reached the top, circled the British artillery position and forced the British from the Heights. General Isaac Brock, one of the most respected British military leaders of his day, was killed leading a counter-attack. Mohawk chiefs John Norton and John Brant and about 80 Haudenosaunee and Delaware warriors held back the Americans for hours — long enough for reinforcements to arrive so that the British could retain the crucial outpost.

The War Measures Act was a federal law adopted by Parliament on 22 August 1914, after the outbreak of the First World War. It gave broad powers to the Canadian government to maintain security and order during war or insurrection. It was used, controversially, to suspend the civil liberties of people in Canada who were considered “enemy aliens” during both world wars, leading to mass arrest and detention without charge or trial. The Act was also invoked during the 1970 October Crisis in Quebec. It has since been replaced by the more limited Emergencies Act.

Antibiotic (or antimicrobial) resistance developed with the wide distribution of antibiotic medications in the 20th century. Resistance occurs when the medication is no longer capable of killing or preventing the reproduction of bacteria. A major global health challenge, antibiotic resistance makes treating diseases more difficult and expensive, and it results in fewer antibiotics that are effective in managing infectious diseases. Rates of antibiotic-resistant infections are rising in Canada. In hospital settings, infections that resist multiple drugs are also becoming more common. In 2019, an expert panel of the Council of Canadian Academies estimated that resistant infections contributed to more than 14,000 deaths in Canada the previous year. Canadian health agencies, medical professionals and industries are active in multiple efforts to combat this problem. 

The October Crisis began 5 October 1970 with the kidnapping of James CROSS, the British trade commissioner in Montréal, by members of the Front de Libération du Québec (FLQ).

The Seven Years' War (1756–63) was the first global war, fought in Europe, India, and America, and at sea. In North America, imperial rivals Britain and France struggled for supremacy. Early in the war, the French (aided by Canadian militia and Aboriginal allies) defeated several British attacks and captured a number of British forts.

The Cold War refers to the period between the end of the Second World War and the collapse of the Soviet Union in 1991, during which the world was largely divided into two ideological camps — the United States-led capitalist “West” and the Soviet-dominated communist “East.” Canada aligned with the West, as its government structure, politics, society and popular perspectives matched those in the US, Britain, and other democratic countries. The global US-Soviet struggle took many different forms and touched many areas, but never became “hot” through direct military confrontation between the two main antagonists.