The National Football League (NFL) and the National Collegiate Athletic Association (NCAA) are respectively the most popular professional and amateur football organizations in the United States. The National Football League was founded in 1920 and has since become the largest and most popular sport in the United States. The NFL has the highest average attendance of any sporting league in the world, with an average attendance of 66,960 persons per game during the 2011 NFL season. While the NFL championship game, the Super Bowl, is a large sporting event in club sports it does not compare in popularity to cricket and international football (soccer), which both have billions of spectators. It is played between the champions of the National Football Conference (NFC) and the American Football C