Quebec Boundaries Extension Act, 1912

It expanded the territory of the Province of Quebec, extending the northern boundary to its present location.

The act transferred to the province all of the Northwest Territories' former District of Ungava except offshore islands.

This is a vast area bounded by the Eastmain River, the Labrador coast, and Hudson and Ungava Bays.

It was first claimed by England in 1670 as Rupert's Land by royal decree, becoming part of Canada after Confederation.

[4][5] Canada and Newfoundland disagreed on the location of the frontier between Quebec and Labrador until 1927.

When Canada was formed in 1867 its provinces were a relatively narrow strip in the southeast, with vast territories in the interior. It grew by adding British Columbia in 1871, PEI in 1873, the British Arctic Islands in 1880, and Newfoundland in 1949; meanwhile, its provinces grew both in size and number at the expense of its territories.
Evolution of the borders of the Province of Quebec