London Conference of 1866 in the context of "Canadian Confederation"

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.