Major professional sports leagues in the United States and Canada
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The major professional sports leagues in the United States and Canada are the highest professional competitions of team sports in the United States and Canada. The four leagues universally included in the definition are Major League Baseball (MLB), the National Basketball Association (NBA), the National Football League (NFL), and the National Hockey League (NHL). Other notable leagues include Major League Soccer (MLS) and the Canadian Football League (CFL).
The NFL, NBA, MLB, and NHL are commonly referred to as the "Big 4." Each of these is the wealthiest professional club competition in its sport worldwide. The best players can become cultural icons in both countries because the leagues enjoy a significant place in popular culture in the U.S. and Canada. The NFL has 32 teams, and the others have 30 each. The vast majority of major league teams are concentrated in the most populous metropolitan areas of the United States and Canada. Unlike the promotion and relegation systems used in sports leagues in various other regions around the world, those clubs in the North American sports leagues usually remain static from season-to-season.
Baseball, football, and hockey have had professional leagues continuously for over 100 years; early leagues such as the National Association, Ohio League, and National Hockey Association formed the basis of the modern MLB, NFL, and NHL, respectively. Soccer was first professionalized in 1894, but leagues suffered greatly from lack of sustainability and seldom lasted more than a decade. Soccer's greatest successes were in the form of the American Soccer League (1921-1933), the original North American Soccer League (1968-1984), and, currently, Major League Soccer (1996–present). Basketball was invented in 1891 and its first professional league formed in the 1920s. The Basketball Association of America formed the basis of the NBA.
Each Big Four league, as well as Major League Soccer and the Canadian Football League, averages at least 15,000 fans in attendance per game as of 2013.
Although individual sports such as golf, tennis, and auto racing are also very popular, the term "major league" is usually limited to team sports. For golf and auto racing, the PGA Tour and NASCAR Sprint Cup serve as the respective major competitions on par with the major leagues in other sports in terms of media coverage, level of competition, and fan following.