Major League Baseball (MLB) is the highest level of play in professional baseball. More specifically, Major League Baseball refers to the organization that operates North American professional baseball's two major leagues, the NationalLeague and the AmericanLeague, by means of a joint organizational structure which has existed between them since 1903. In 2000, the American and National leagues were officially disbanded as separate legal entities with all rights and functions consolidated in the commissioner's office. MLB effectively operates as a single league and as such it constitutes one of the major professional sports leagues of North America.
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