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Major League Baseball (MLB) is divided into two leagues, the American league, with fourteen teams, and the national league, with sixteen teams. Each league is further subdivided into three divisions, labeled East, Central, and West. The unequal balance of teams, into even-sized leagues, prevents the need for interleague games (which two odd-sized fifteen-team leagues would have) to fill schedules.

Though historically separate leagues, distinction has all but disappeared. In 1903, the 2 leagues began to meet in an end-of-year championship series called the world series, In 1920, the formerly weak National Commission, which was created to manage relationships between the two leagues, was replaced with an all powerful commissioner of baseball, who had the power to make decisions for all professional baseball unilaterally. The two leagues remained distinct, in as far as playing schedule, except for the annual all-star game and the world series, until 1997 when regular season interleague play began. In 2000, the American and National Leagues were dissolved as legal entities, and Major League Baseball became a singular league de jure, though it had operated as a de facto single entity for many years.