The National Football League (NFL) is the largest professional American football league in the world. It was formed by eleven teams in 1920 as the American Professional Football Association (the league changed the name to the National Football League in 1922). The league currently consists of thirty-two teams from the United States.While baseball is known as "America's national pastime," football, in the eyes of many, is the most popular sport in the United States.Fans from all around the world come to see this grand event.Check this out!