 Initially, the systems brought American stations to viewers in Canada who had no Canadian stations to watch; broadcast television, though begun late in 1952 in Toronto and Montreal, did not reach a majority of cities until 1954.In time, cable television was widely established to carry available Canadian stations as well as import American stations, which constituted the vast majority of signals on systems (usually only one or two Canadian stations, while some systems had duplicate or even triplicate coverage of American networks).During the 1970s, a growing number of Canadian stations pushed American channels off the systems, forcing several to expand beyond the original 12-channel system configurations.