The World Series began in 1903 when Pittsburgh of the older National League (founded in 1876) invited Boston of the American League (founded in 1901) to play a best-of-9 game series to determine which of the two league champions was the best. Boston was the surprise winner, 5 games to 3. The 1904 NL champion New York Giants refused to play Boston the following year, so there was no series. Giants' owner John T. Brush and his manager John McGraw both despised AL president Ban Johnson and considered the junior circuit to be a minor league. By the following year, however, Brush and Johnson had smoothed out their differences and the Giants agreed to play Philadelphia in a best-of-7 game series. Since then the World Series has been a best-of-7 format, except from 1919-21 when it returned to best-of-9.
After surviving two world wars and an earthquake in 1989, the World Series was cancelled for only the second time in 1994 when the players went out on strike August 12 to protest the owners' call for revenue sharing and a salary cap. On September 14, with no hope of reaching a labor agreement to end the 34-day strike, the owners called off the remainder of the regular season and the entire postseason. The strike ended after 232 days on March 31, 1995.