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30 teams
There are 2 leagues. American League and National League.
30 teams
About 20 percent :)
As of right now(2012), there are 16 National League and 14 American League teams. In 2013, the Astros will be moving to the American League which will make the leagues even at 15/15.
The Copa Libertadores features a total of 47 teams that compete in the tournament. These teams include champions from various South American leagues, as well as teams that qualify through their domestic leagues. The tournament structure includes a group stage followed by knockout rounds, culminating in the final.
There are 30 National Hockey League teams in North America, 24 in the United States and 6 in Canada. In 2011 this changed to 23 teams in the United States and 7 in Canada when the Atlanta Thrashers were bought and moved to Winnipeg, Canada, becoming the Winnipeg Jets.
There were nine teams that were in the CFL at the beginning of the leagues formation.
32 football teams NFL
How many college basketball teams played in 1939
There are 16 teams in CBA (Chinese Basketball Association).
In all, there are 30 Major League teams. The New York Yankees are the best by far with 26 World Series wins.