endence and ceded territories south of the Great Lakes to the United States. New Brunswick was split from Nova Scotia as part of a reorganization of Loyalist settlements in the Maritimes. To accommodate English-speaking Loyalists in Quebec, the Constitutional Act of 1791 divided the province into French-speaking Lower Canada (later Quebec) and English-speaking Upper Canada (later Ontario), granting each its own elected legislative assembly.
The Canadas were the main front in the War of 1812 between the United States and Britain. Following the war, large-scale immigration to Canada from Britain and Ireland began in 1815. Between 1825 and 1846, 626,628 European immigrants reportedly landed at Canadian ports. Between one-quarter and one-third of all Europeans who immigrated to Canada before 1891 died of infectious diseases.
The desire for responsible government resulted in the abortive Rebellions of 1837. The Durham Report subsequently recommended responsible government and the assimilation of French Canadians into English culture. The Act of Union 1840 merged the Canadas into a united Province of Canada. Responsible government was established for all British North American provinces by 1849. The signing of the Oregon Treaty by Britain and the United States in 1846 ended the Oregon boundary dispute, extending the border westward along the 49th parallel. This paved the way for British colonies on Vancouver Island (1849) and in British Columbia (1858).
Confederation and expansion
Following several constitutional conferences, the 1867 Constitution Act officially proclaimed Canadian Confederation on July 1, 1867, initially with four provinces – Ontario, Quebec, Nova Scotia, and New Brunswick. Canada assumed control of Rupert's Land and the North-Western Territory to form the Northwest Territories, where the Métis' grievances ignited the Red River Rebellion and the creation of the province of Manitoba in July 1870. British Columbia and
