Starting with the 1763 Treaty of Paris, New France, of which the colony of Canada was a part, formally became a part of the British Empire. The Royal Proclamation of 1763 enlarged the colony of Canada under the name of the Province of Quebec, which with the Constitutional Act 1791 became known as the Canadas. With the Act of Union 1840, Upper and Lower Canada were joined to become the United Province of Canada.

The Province of Lower Canada was a British colony on the lower Saint Lawrence River and the shores of the Gulf of Saint Lawrence (1791–1841). It covered the southern portion of the current Province of Quebec and the Labrador region of the current Province of Newfoundland and Labrador.