The regular season ended on September 29, with the Cincinnati Reds and Chicago White Sox as the regular season champions of the National League and American League, respectively.
The Cincinnati Reds defeated the Chicago White Sox, five games to three, capturing their first championship in franchise history.
The Black Sox Scandal, for which the 1919 season is best remembered for, saw the Chicago White Sox throw (purposely lose) the World Series to the Cincinnati Reds, 5–3, in order to illegally gain money from gambling.
The new commissioner, Kenesaw Mountain Landis, banned eight players from baseball for life.
The National League regular season ended on September 28, while the American League regular season ended on September 29 with the New York Yankees defeating the Philadelphia Athletics 4–2 at Shibe Park.