Basketball is the second most popular sport in the United States (counting amateur levels), after American football. In terms of revenue, the National Basketball Association (NBA) is the third most profitable sports league in the United States and the world, after the National Football League (NFL) and Major League Baseball (MLB). According to the National Sporting Goods Association, over 26 million Americans play basketball regularly, more than any other team sport.Basketball was invented in 1891 by Canadian physical education teacher James Naismith in Springfield, Massachusetts.