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There are 14 teams in the American League. There are also 16 in the National League.
There were 30 teams in the MLB, 14 in the American League and 16 in the National League.
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.
At the start of the 2012 MLB Season there are 30 teams, 16 in the national league and 14 in the american league. Starting 2013, both leagues will have 15 teams each with the Houston Astros being moved to the American League West division as required by Bud Selig.