Rules of the Game: For FIFA matches, the ball should have a circumference of not more than 70 cm (28 ins) and not less than 68 cm (27 ins).
Rules of the Game: The ball is in play at all other times, including when it rebounds from a goalpost, crossbar or corner flag post and remains in the field of play.
The 1970 and 1986 World Cups were held in Mexico.
Of the 16 members of the USA's first World Cup team in 1930, five were born in Scotland and one in England.
The United States has never won a World Cup game on European soil.