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), whereas territorial governments are creatures of statute with powers delegated to them by the Parliament of Canada. The powers flowing from the Constitution Act are divided between the Government of Canada (the federal government) and the provincial governments to exercise exclusively. A change to the division of powers between the federal government and the provinces requires a constitutional amendment, whereas a similar change affecting the territories can be performed unilaterally by the Parliament of Canada or government. In modern Canadian constitutional theory, the provinces are considered to be co-sovereign within certain areas based on the divisions of responsibility between the provincial and federal government within the Constitution Act, 1867, and each province thus has its own representative of the Canadian Crown, the lieutenant governor. The territories are not sovereign, but instead their authorities and responsibilities are devolved directly from the federal level, and as a result, have a commissioner that represents the federal government. Provinces Notes: Territories There are three territories in Canada. Unlike the provinces, the territories of Canada have no inherent sovereignty and have only those powers delegated to them by the federal government. They include all of mainland Canada north of latitude 60° north and west of Hudson Bay and all islands north of the Canadian mainland (from those in James Bay to the Queen Elizabeth Islands). The following table lists the territories in order of precedence (each province has precedence over all the territories, regardless of the date each territory was created). Another territory, the District of Keewatin, existed from October 7, 1876, until September 1, 1905, when it rejoined the Northwest Territories and became the Keewatin Region. It occupied the area that is now the Kenora District of Ontario,