What is the most popular sport in the united states?

Early soccer leagues in the U.S. mostly used the name football leagues: for example, the American Football Association (founded in 1884), the American Amateur Football Association (1893), the American League of Professional Football (1894), the National Association Foot Ball League (1895), and the Southern New England Football League (1914). However, the word "soccer" was beginning to catch on, and the St Louis Soccer League was a significant regional competition between 1907 and 1939. What is now the United States Soccer Federation was originally the U.S. Football Association, formed in 1913 by the merger of the American Football Association and the American Amateur Football Association. The governing body of the sport in the U.S. did not have the word soccer in its name until 1945, when it became the U.S. Soccer Football Association. It did not drop the word football from its name until 1974, when it became the U.S. Soccer Federation.