<P> The active history of broadcasting in Canada begins in 1921, as Canadians were swept up in the radio craze and built radio sets to listen to American stations . </P> <P> Main themes in the history include the development of the engineering technology; the construction of stations and the building of networks; the widespread purchase and use of radio and television sets by the public; debates regarding state versus private ownership of stations; financing of the broadcast media through the government, licence fees, and advertising; the changing content of the programming; the impact of the programming on Canadian identity; the media's influence on shaping audience responses to music, sports and politics; the role of the Québec government; Francophone versus Anglophone cultural tastes; the role of other ethnic groups and First Nations; fears of American cultural imperialism via the airwaves; and the impact of the Internet and smartphones on traditional broadcasting media . </P>

When did the radio become popular in canada