Major League (also major league)
In North America, the term Major League Baseball generally refers to the top-level quality of baseball play. More specifically, Major League Baseball (MLB) refers to the two top leagues, the National League and the American League, and the joint organizational structure which has existed between them since 1901. MLB has a Commissioner, maintains joint umpiring crews, and negotiates marketing and television contracts for the two major leagues. This structure and the major league ownership of minor league baseball is possible because of a 1922 court decision in which baseball was ruled a local affair and not interstate commerce subject to antitrust law, an exemption which does not apply to other sports. For more information about Major League Baseball, check out its official website at http://mlb.mlb.com. The website at http://en2.wikipedia.org/wiki/Major_league_baseball also offers good introductory information on Major League Baseball in the US.
