the west By emily123 Dec 7, 1817 Smallpox epidemics killed many Indians Dec 10, 1857 gold was discovered in the Cariboo gold fields Dec 7, 1867 the USA purchased Alaska USA from Russia Dec 7, 1868 building of railroads across the American prairies Dec 7, 1870 Manitoba Act Dec 7, 1875 The North-West Territories Act Dec 7, 1876 -West Territories, and was governed by the lieutenant-governor of Manitoba until Dec 7, 1876 Indian Act was passed Dec 7, 1885 the completion of the CPR Dec 10, 1999 The North-West Territories was divided into two territories