Undisputed champion recognised a different champion. The disputes were usually short-lived as a lucrative fight would be organised between the rival champions. The longest split was ten years, of the middleweight title, between Mickey Walker's move up to heavyweight in 1931 and NBA champion Tony Zale's defeat of NYSAC contender Georgie Abrams in 1941. An early use of "undisputed" appears in a "New York Times" preview of the 1941 fight. The growing popularity of boxing outside of the USA led to creation of various boxing organizations, each strengthening their influence (most notably BBBofC) and having their own champion. This resulted in a
USA Boxing Union) Boxing championships. The Championships crown a United States Amateur Champion in each of the sanctioned weight classes. USA Boxing organizes the USA Knockouts team in the World Series of Boxing. Weight Classes - Elite Men Weight Classes - Elite Women Below are the lists of the national amateur champions, by division: USA Boxing USA Boxing is the national governing body for Olympic-style amateur boxing. It is overseen by the United States Olympic Committee and the International Boxing Association (AIBA), which sets its rules. Headquartered in Colorado Springs, CO, USA Boxing is a non-profit organization responsible for the administration, development