Canadian Football League
The Canadian Football League (CFL; ) is a professional sports league in Canada. The CFL is the highest level of competition in Canadian football. Its nine teams, which are located in nine separate cities throughout Canada, are divided into two divisions: the East Division, with four teams, and the West Division with five teams.
Major professional sports leagues in the United States and Canada
The NHL has been the dominant professional sports league in Canada, and was first established in Canada in 1917. 
The NHL was initially based entirely in eastern Canada; by 1925, Hamilton and Quebec City no longer had NHL teams, while Ottawa would leave in 1934, by which point American teams were slowly being added. The first Canadian expansion team would come in 1970 with a team in Vancouver; the NHL later added teams in Edmonton, Winnipeg and Quebec City (through absorption of WHA franchises), Calgary (via relocation from Atlanta) and Ottawa (via expansion) to go with the still-extant Toronto and Montreal teams. The distinctive place hockey holds in Canadian culture allowed these franchises to compete with teams in larger cities for some time. However, the teams in Winnipeg and Quebec City were eventually moved to larger media markets in the U.S. The NHL returned to Winnipeg for the 2011–12 season, with the Atlanta Thrashers relocating to become the current version of the Winnipeg Jets. Excluding the CFL, the NHL is the only major league to have teams in Edmonton, Calgary, Winnipeg or Ottawa, all markets with fewer than 1.25 million, smaller than any U.S. NHL market except Buffalo. However, those Canadian cities benefit from the country's very high level of hockey fandom. A 2013 study by Nate Silver estimated that all of these markets had roughly the same numbers of avid hockey fans as U.S. markets with several times their total population.