Province of Canada in the context of "Quebec Conference, 1864"

Canada has ten provinces and three territories that are sub-national administrative divisions under the jurisdiction of the Canadian Constitution. In the 1867 Canadian Confederation, three provinces of British North America—New Brunswick, Nova Scotia, and the Province of Canada (which upon Confederation was divided into Ontario and Quebec)—united to form a federation, becoming a fully independent country over the next century. Over its history, Canada's international borders have changed several times as it has added territories and provinces, making it the world's second-largest country by area.

The major difference between a Canadian province and a territory is that provinces receive their power and authority from the Constitution Act, 1867 (formerly called the British North America Act, 1867). Territories are federal territories whose territorial governments have powers delegated to them by the Parliament of Canada. Powers are divided between the Government of Canada (the federal government) and the provincial governments by the Constitution Act, either exclusively or concurrently. A change to the division of powers between the federal government and the provinces requires a constitutional amendment. A similar change affecting the territories can be performed unilaterally by the government or Parliament of Canada.

The Westminster system, or Westminster model, is a type of parliamentary government modelled on that of the Parliament of the United Kingdom. Key aspects of the system include an executive branch made up of members of the legislature which is responsible to the legislature; the presence of parliamentary opposition parties; and a ceremonial head of state who is separate from the head of government. The term derives from the Palace of Westminster, the seat of the British parliament. The Westminster system can be contrasted with the presidential system, which originated in the United States, and with the semi-presidential system based on the government of France.

The Westminster system is used, or was once used, in the national and subnational legislatures of most former colonies of the British Empire upon gaining self-government, beginning with the Province of Canada in 1848. However, many former colonies have since adopted other forms of government.

Canadian Confederation (French: Confédération canadienne) was the process by which three British North American provinces—the Province of Canada, Nova Scotia, and New Brunswick—were united into one federation, called the Dominion of Canada, on July 1, 1867. This process occurred with the rising tide of Canadian nationalism that was then beginning to swell within these provinces and others. It reached fruition through the British North America Act, 1867 (today known as the Constitution Act, 1867) which had been based on resolutions agreed to by colonial delegates in the 1864 Quebec Conference, later finalized in the 1866 London Conference.

Upon Confederation, Canada consisted of four provinces: Ontario and Quebec, which had been split out from the Province of Canada, and the provinces of Nova Scotia and New Brunswick. The province of Prince Edward Island, which had hosted the first meeting to consider Confederation, the Charlottetown Conference, did not join Confederation until 1873. Over the years since Confederation, Canada has seen numerous territorial changes and expansions, resulting in the current collection of ten provinces and three territories.

Quebec (French: Québec) is Canada's largest province by area. Located in Central Canada, the province shares borders with the provinces of Ontario to the west, Newfoundland and Labrador to the northeast, New Brunswick to the southeast and a coastal border with the territory of Nunavut. In the south, it shares a border with the United States. Quebec has a population of around 8 million, making it Canada's second-most populous province only behind Ontario.

Between 1534 and 1763, what is now Quebec was the French colony of Canada and was the most developed colony in New France. Following the Seven Years' War, Canada became a British colony, first as the Province of Quebec (1763–1791), then Lower Canada (1791–1841), and lastly part of the Province of Canada (1841–1867) as a result of the Lower Canada Rebellion. It was confederated with Ontario, Nova Scotia, and New Brunswick in 1867. Until the early 1960s, the Catholic Church played a large role in the social and cultural institutions in Quebec. However, the Quiet Revolution of the 1960s to 1980s increased the role of the Government of Quebec in l'État québécois (the public authority of Quebec).

The history of post-confederation Canada began on July 1, 1867, when the British North American colonies of Canada, New Brunswick, and Nova Scotia were united to form a single Dominion within the British Empire. Upon Confederation, the Province of Canada was immediately split into the provinces of Ontario and Quebec. In 1870, Canada acquired the vast expanse of the continent controlled by the Hudson's Bay Company, which was eventually divided into new territories and provinces. British Columbia joined in 1871, and Prince Edward Island in 1873. Canada evolved into a fully sovereign state by 1982.

Before being part of British North America, the constituents of Canada consisted of the former colonies of Canada and Acadia from within New France which had been ceded to Great Britain in 1763 as part of the Treaty of Paris. French Canadian nationality was maintained as one of the "two founding nations" and legally through the Quebec Act which ensured the maintenance of the Canadian French language, Catholic religion, and French civil law within Canada, a fact which remains true today.

While a variety of theories have been postulated for the name of Canada, its origin is now accepted as coming from the Laurentian language word kanata, meaning 'village' or 'settlement'. In 1535, indigenous inhabitants of the present-day Quebec City region used the word to direct French explorer Jacques Cartier to the village of Stadacona. Cartier later used the word Canada to refer not only to that particular village but to the entire area subject to Donnacona (the chief at Stadacona); by 1545, European books and maps had begun referring to this small region along the Saint Lawrence River as Canada.

From the 16th to the early 18th century, Canada referred to the part of New France that lay along the Saint Lawrence River. In 1791, the area became two British colonies called Upper Canada and Lower Canada. These two colonies were collectively named the Canadas until their union as the British Province of Canada in 1841.

The London Conference (French: Conférence de Londres) was held in London, in the United Kingdom, in 1866. It was the third and final in a series of conferences that led to Canadian Confederation in 1867. Sixteen delegates from the Province of Canada, Nova Scotia, and New Brunswick gathered to set out the final outline of the proposed Canadian Confederation, resulting in the British North America Act, 1867 (now the Constitution Act, 1867).

Upon the conclusion of the discussions by the delegates, the British government directed that a bill be drafted to implement the resolutions of the Conference. Introduced in 1867, the British North America Act, 1867 was passed by both Houses of Parliament and then received royal assent from Queen Victoria on March 29, 1867. It was proclaimed in force on July 1, 1867, creating the Dominion of Canada.