List of World Series champions
The World Series is the annual championship series of Major League Baseball (MLB) and concludes the MLB postseason. First played in 1903, the World Series championship is determined through a best-of-seven playoff and is a contest between the champions of baseball's National League (NL) and American League (AL). Often referred to as the "Fall Classic", the modern World Series has been played every year since 1903 with two exceptions: in 1904, when the NL champion New York Giants declined to play the AL champion Boston Americans; and in 1994, when the series was canceled due to the players' strike.
World Series
The National and American Leagues operated under essentially identical rules until 1973, when the American League adopted the designated hitter (DH) rule, allowing its teams to use another hitter to bat in place of the (usually) weak-hitting pitcher. The National League did not adopt the DH rule. This presented a problem for the World Series, whose two contestants would now be playing their regular-season games under different rules. From 1973 to 1975, the World Series did not include a DH. Starting in 1976, the World Series allowed for the use of a DH in even-numbered years only. (The Cincinnati Reds swept the 1976 Series in four games, using the same nine-man lineup in each contest. Dan Driessen was the Reds' DH during the series, thereby becoming the National League's first designated hitter.) Finally, in 1986, baseball adopted the current rule in which the DH is used for World Series games played in the AL champion's park but not the NL champion's. Thus, the DH rule's use or non-use can affect the performance of the home team.