As the Boston Celtics were dominating the NBA in the 1960s, another professional basketball league was formed. The American Basketball Association, founded in 1967, introduced new features to the game of basketball, such as the three point line. However, attendence was not high at ABA games and the league suffered. In 1976, the four most successful ABA teams joined the NBA, and the ABA folded.
Click below to learn about the competition between the NBA and ABA.
Click below to learn about the NBA-ABA merger.