Lacrosse in different cities, flying into town for games. Canadians and Native Americans make up over 90% of the players. The NLL started in 1987 as the Eagle Pro Box Lacrosse League. Teams in Philadelphia, New Jersey, Baltimore and Washington, DC, played a 6-game season. The league operated as the Major Indoor Lacrosse League from 1989 to 1997, when there were six teams playing a 10-game schedule. The current NLL name began in the 1998 season, which included the first Canadian team. The most successful franchises have been the Toronto Rock and the now-defunct Philadelphia Wings, each has won six championships.
Field lacrosse member William George Beers codified the modern game. He established the Canadian Lacrosse Association and created the first written rules for the game, "Lacrosse: The National Game of Canada". The book specified field layout, lacrosse ball dimensions, lacrosse stick length, number of players, and number of goals required to determine the match winner. Field lacrosse involves two teams, each competing to shoot a lacrosse ball into the opposing team's goal. A lacrosse ball is made out of solid rubber, measuring 7.75 to 8 inches (19.7–20 cm) in circumference and weighing 5 to 5.25 ounces (140–149 g). Each team plays with