The Manitoba Act , originally titled An Act to amend and continue the Act 32-33 Victoria, chapter 3; and to establish and provide for the Government of the Province of Manitoba, is an act of the Parliament of Canada that is defined by the Constitution Act, 1982 as forming a part of the Constitution of Canada. The act, which received the royal assent on May 12, 1870, created the province of Manitoba and continued in force An Act for the Temporary Government of Rupert's Land and the North-Western Territories when united with Canada upon the absorption of the British territories of Rupert's Land and the North-Western Territory into Canada on July 15, 1870.