Rules of the Game: For FIFA matches, the ball should weigh not more than 450 g (16 oz) and not less than 410 g (14 oz) at the start of the match.
Rules of the Game: The goal lines should be the same width as that of the goalposts and the crossbar.
The United States is a member of CONCACAF, the Confederation of North, Central American and Caribbean Association Football.
The North American Soccer League (NASL) existed from 1968 to 1984 with teams in the United States and Canada.
Columbus Crew Stadium, which opened in 1999, was the first stadium in the US built specifically for a MLS team. It has a seating capacity of 22,500.