Sports in the United States is an important part of culture in the United States. American football is the most popular spectator sport to watch in the United States, followed by baseball, basketball, ice hockey and soccer, which make up the "5 major sports". Indoor soccer, indoor American football, Rugby union, Rugby league, tennis, golf, auto racing, softball, field lacrosse, box lacrosse, handball, volleyball, cricket, Australian rules football, field hockey, and water polo are also played in the country. Based on Olympic Games, World Championships, and other major competitions in respective sports, the United States is one of the most successful sports nations in the world.