The border between Labrador and Canada was set March 2, 1927, after a tortuous five - year trial. In 1809 Labrador had been transferred from Lower Canada to Newfoundland, but the landward boundary of Labrador had never been precisely stated. Newfoundland argued it extended to the height of land, but Canada, stressing the historical use of the term "Coasts of Labrador '', argued the boundary was 1 statute mile (1.6 km) inland from the high - tide mark. As Canada and Newfoundland were separate Dominions, but both members of the British Empire, the matter was referred to the Judicial Committee of the Privy Council (in London), which set the Labrador boundary mostly along the coastal watershed, with part being defined by the 52nd parallel north. One of Newfoundland 's conditions for joining Confederation in 1949 was that this boundary be entrenched in the Canadian constitution. While this border has not been formally accepted by the Quebec government, the Henri Dorion Commission (Commission d'étude sur l'intégrité du territoire du Québec) concluded in the early 1970s that Quebec no longer has a legal claim to Labrador.
when did labrador become a part of newfoundland
1809