There are 2 leagues. American League and National League.
In the major leagues, there are 29 baseball teams in the US; but there is one major league team, the Toronto Blue Jays, in Canada.
Yes, Ryan pitched for teams in both the American and National leagues.
Major League Baseball (MLB) teams are divided between National and American League. Within these leagues, teams are further divided into divisions: East, Central, and West; therefore, in total, there are six (6) divisions (or "conferences") in MLB, including National League East, National League Central, National League West, American League East, American League Central, and American League West teams.
American Professional Baseball is made up into 2 divisions or leagues. After a season of play and a couple of weeks of playoffs the 2 leagues, the American and National send their champions to the World Series. Although called the World Series there are only American teams participating. The recent World baseball classic showed American baseball is not the only dominate team around.
There are two leagues in major league baseball, the American League and the National League. There are about 19 leagues in minor league baseball that include the Arizona League, Appalachian League, California League, Pacific Coast League, International League, and others.
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.
The American League is one of the two leagues in Major League Baseball. There are currently 15 teams in the American 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.
In 1960, both the American and National leagues still had eight teams, and both leagues played 154 game schedules
There are 14 teams in the American League. There are also 16 in the National League.