Political map of the Arctic & the Far North 15 July 1870 (Rupert's Land Act): The threat posed by the Alaska Purchase helped encourage the British to assent to the creation of a united, self-governing Dominion of Canada (Canadian Confederation). Canada quickly expanded as Britain began to transfer its other North American possessions (British North America) to the dominion. First up were Rupert's Land and the North-Western Territory, which were sold to Canada for £300,000 (Rupert%27s Land Act 1868). The Rupert's Land sale antagonized the mixed ancestry Métis of the Red River Colony, who asserted themselves under Louis Riel (Red River Rebellion) but were mostly placated when Canada agreed to their demands and created the province of Manitoba (Manitoba Act).