Question: where is american football most popular in the world

title: American football
text: The three types of scrimmage kicks are place kicks , drop kicks , and punts . Only place kicks and drop kicks can score points . The place kick is the standard method used to score points , because the pointy shape of the football makes it difficult to reliably drop kick . Once the ball has been kicked from a scrimmage kick , it can be advanced by the kicking team only if it is caught or recovered behind the line of scrimmage . If it is touched or recovered by the kicking team beyond this line , it becomes dead at the spot where it was touched . The kicking team is prohibited from interfering with the receiver 's opportunity to catch the ball , and the receiving team has the option of signaling for a fair catch . This prohibits the defense from blocking into or tackling the receiver , but the play ends as soon as the ball is caught and the ball may not be advanced .