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In page Hudson Bay:

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The HBC's trade monopoly was abolished in 1870, by a British Order in Council called the Deed of Surrender, ceded Rupert's Land to Canada, an area of approximately 3,900,000 km2 (1,500,000 sq mi), as part of the Northwest Territories.[4]: 427  In 1912, the western shore south of 60° and, following the Quebec Boundaries Extension Act, 1912, all the eastern shore were transferred to the adjacent provinces, but the bay and offshore islands remained part of the Northwest Territories. Starting in 1913, the bay was extensively charted by the Canadian government's CSS Acadia to develop it for navigation.[9] This mapping progress led to the establishment of Churchill, Manitoba, as a deep-sea port for wheat exports in 1929, after unsuccessful attempts at Port Nelson.[citation needed]