Major professional sports leagues in the United States and Canada
The Canadian Football League is the highest level of play in Canadian football. The league was organized in 1956 as a cooperative agreement between two regional leagues, the Big Four (which dated to 1907) and the WIFU (which was founded in 1936), and became independent from Football Canada in 1958. The league now consists of nine teams, all based in Canada. The Grey Cup is awarded annually to the champion every November and is the highest attended sporting event in the nation. The oldest extant teams, the Hamilton Tiger-Cats and the Toronto Argonauts, trace their origins to the late 1860s and early 1870s, which ranks them amongst the oldest professional sports teams of any kind still in existence on the continent. The CFL attempted an expansion into the United States in cities that had no NFL team between 1993 and 1995, though the expansion teams all either folded or relocated to Canadian cities.
Major League Soccer
Major League Soccer (MLS) is a men's professional football league sanctioned by the United States Soccer Federation which represents the sport's highest level in the United States. The league comprises 24 teams—21 in the U.S. and 3 in Canada and constitutes one of the major professional sports leagues in both countries. The regular season runs from March to October, with each team playing 34 games; the team with the best record is awarded the Supporters' Shield. Fourteen teams compete in the postseason MLS Cup Playoffs through October and November, culminating in the championship game, the MLS Cup. MLS teams also play in domestic competitions against teams from other divisions in the U.S. Open Cup and in the Canadian Championship. MLS teams also compete against continental rivals in the CONCACAF Champions League.