Since invented in 1891, basketball has evolved to become one of the world’s most popular and widely viewed sports. Its fans are present all over the world. Many major basketball tournaments are held, including the NBA – the premier men’s professional basketball league in the world as well as one of the major professional sports leagues in the United States and Canada.The National Basketball Association (NBA) is a professional basketball league in North America. The league is composed of 30 teams in total. There are 29 NBA teams in the United States: Golden State Warriors, Brooklyn Nets, Milwaukee Bucks, Los Angeles Clippers, Philadelphia 76ers, Houston Rockets, Los Angeles Lakers, Washington Wizards, Utah Jazz, Sacramento Kings, Portland Trail Blazers, Phoenix Suns, Orlando Magic, Oklahoma City Thunder, New York Knicks, New Orleans Pelicans, Minnesota Timberwolves, Miami Heat, Memphis Grizzlies, Indiana Pacers, Detroit Pistons, Denver Nuggets, Dallas Mavericks, Cleveland Cavaliers, Chicago Bulls, Charlotte Hornets, Boston Celtics, Atlanta Hawks and San Antonio Spurs. there is only one MLB team from Canada, the Toronto Raptors. NBA teams and their players all have a lot of fans. Because of that, a lot of NBA merchandise was sold.