Manitoba Day Timeline By 25benipm 1868 Rupert's land is sold to the Dominion of Canada 1869 Metis national committee was formed 1869 Upper Fort Garry was seized Dec 8, 1869 A provisional government consisting of both English-speaking and French-speaking Métis was formed Mar 4, 1870 Thomas Scott's execution May 12, 1870 The Manitoba Act receives Royal Assent Jul 15, 1870 The Manitoba Act is officially proclaimed Jul 15, 1870 Manitoba joins the Confederation of Canada Mar 10, 1992 Ottawa officially recognized Louis Riel as the founder of Manitoba