Seattle Mariners
New York Mets
Los Angeles Angels
Colorado Rockies
Arizona Diamondbacks
Los Angeles Dodgers
Washington Nationals
Miami Marlins
Major League Baseball (MLB) is a professional baseball organization that constitutes one of the four major professional sports leagues in North America. It is the oldest league of the four. Teams play in the American League (AL) and National League (NL), which operated as separate legal entities from 1901 and 1876 respectively. In 2000, the leagues merged into a single organization led by the Commissioner of Baseball. The organization oversees minor league baseball leagues, which operate about 240 teams affiliated with the major-league clubs. With the International Baseball Federation, the league also manages the international World Baseball Classic tournament.
Baseball's first professional team was founded in Cincinnati in 1869. The first few decades of professional baseball were chara…
