Heavyweight unification series Heavyweight unification series The heavyweight unification series, also known as the Heavyweight World Series, was a sequence of professional boxing matches held in 1986 and 1987 to crown an undisputed champion of the heavyweight class. The series was produced by HBO Sports and promoted by Don King. It ended with Mike Tyson as undisputed champion, holding the championship belts of the International Boxing Federation, World Boxing Association, and World Boxing Council. Prior to the series, the last undisputed heavyweight champion had been Leon Spinks, who won the championship in his 1978 victory over Muhammad Ali. Spinks had been stripped of
Boxing in the 1930s Boxing in the 1930s Boxing in the 1930s was affected by one of the biggest economic struggles in the history of the United States: the depression era. Because of the suffering American economy, many boxers were offered lower amounts of money causing them to not box with passion. When the decade began, there was no champion the world heavy weight title belonged to no one. The sport boxing was boycotted for lack of money to output to the boxers. The Heavyweight division, from 1930 to 1937 in particular, could be compared to the Heavyweight division of the 1980s. Six champions