I am a big fan of the San Antonio Spurs.  They play in the Western Confrence of the NBA
I love watching NBA!  How old is that team?
They actually came from the old ABA and moved over to the NBA in 1976 after the merger.
What is the ABA?  I am unfamiliar with that term.
The ABA was the AMerican Basketball Association.  It began in 1967 to challenge the NBA.
Oh!  That makes sense!  I NBA the most popular sport in America?
They might not be the most popular sport, but the NBA does have the highest paid athletes by average annual salary.  So they are doing something right