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30 teams
The NBA (National Basketball Association) was founded in 1949 when BAA (Basketball Association of America) and NBL (National Basketball League) were combined. There were a total of 17 teams in this league.
Beginning with the 2013 Major League Baseball season, there will be 15 teams in the National League and 15 in the American League. A longtime imbalance between the two leagues is being solved by the transfer of the Houston Astros from the N.L. Central to the A.L. West.
There are currently 30 teams.
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