Rules of the Game: The center mark of a field is indicated at the midpoint of the halfway line. A circle with a radius of 9.15 m (10 yds) is marked around it.
CONCACAF, the Confederation of North, Central American and Caribbean Association Footbal, was founded in 1961 and has 40 member associations.
Italy's famous 82,955-seat San Siro stadium is home to both AC Milan and Inter Milan. The two team's played each other in the ground's first game in 1926.
In the early years of of the game, American soccer was dominated by teams from New England, particularly Fall River, New Bedford and Pawtucket.
London's new Wembley Stadium, which opened in 2007, has a seating capacity of 90,000.