how much mlb teams are there?
Baltimore Orioles New York Mets Los Angeles Dodgers San Diego Padres Detroit Tigers San Francisco Giants Milwaukee Brewers Tampa Bay Rays New York Yankees Chicago Cubs
entailment
 Today , MLB is composed of thirty teams : twenty @-@ nine in the United States and one in Canada . Teams play 162 games each season and five teams in each league advance to a four @-@ round postseason tournament that culminates in the World Series , a best @-@ of @-@ seven championship series between the two league champions that dates to 1903 . Baseball broadcasts are aired throughout North America and in several other countries throughout the world . Games are aired on television , radio , and the Internet . MLB has the highest season attendance of any sports league in the world with more than 73 million spectators in 2015 . 

entailment
 Major League Baseball ( MLB ) is a professional baseball organization , the oldest of the four major professional sports leagues in the United States and Canada . A total of 30 teams now play in the American League ( AL ) and National League ( NL ) , with 15 teams in each league . The AL and NL operated as separate legal entities from 1901 and 1876 respectively . After cooperating but remaining legally separate entities since 1903 , the leagues merged into a single organization led by the Commissioner of Baseball in 2000 . The organization also oversees Minor League Baseball , which comprises about 240 teams affiliated with the Major League clubs . With the World Baseball Softball Confederation , MLB manages the international World Baseball Classic tournament . 

entailment
 In 1920 , the weak National Commission , which had been created to manage relationships between the two leagues , was replaced with the much more powerful Commissioner of Baseball , who had the power to make decisions for all of professional baseball unilaterally . For 60 years , the American and National Leagues fielded eight teams apiece . 

entailment
 From 1903 to 1953 , the two major leagues consisted of two eight @-@ team leagues . The 16 teams were located in ten cities , all in the northeastern and midwestern United States : New York City had three teams and Boston , Chicago , Philadelphia , and St. Louis each had two teams . St. Louis was the southernmost and westernmost city with a major league team . The longest possible road trip , from Boston to St. Louis , took about 24 hours by railroad . In 1953 , the NL 's Boston Braves became the Milwaukee Braves . In 1954 , the St. Louis Browns became the Baltimore Orioles . In 1955 , the Philadelphia Athletics became the Kansas City Athletics . 

entailment
 In the United States and Canada , professional Major League Baseball ( MLB ) teams are divided into the National League ( NL ) and American League ( AL ) , each with three divisions : East , West , and Central . The major league champion is determined by playoffs that culminate in the World Series . The top level of play is similarly split in Japan between the Central and Pacific Leagues and in Cuba between the West League and East League . 
