Owing to business rivalry between the two leagues, especially in New York, and to personal animosity between Giants' manager John McGraw and American League President Ban Johnson, the Giants declined to meet the champions of the "junior" or "minor" league. McGraw even said his Giants were already the world champions since they were the champions of the "only real major league."
As early as July 5, 1904, as reported in Sporting Life, Giants' owner John T. Brush had stated publicly, and in defiance of a preseason agreement for a World's Championship Series between the leagues, that his National League club would not play the winner of the American League "if each wins the pennant in its respective league". At that point in the season, the Giants were comfortably on top of the NL standings, and the New York Yankees/Highlanders were just 1 1/2 games behind the Boston Americans. The American League race went down to the wire, and the Highlanders temporarily took over first place on October 7 when they defeated Boston. But Boston won three of their four remaining contests and clinched the AL pennant. The Giants, who had won the NL by a wide margin, stuck to and broadened their plan, refusing to play any AL club, either the champion Boston or the cross-town New York team, in the proposed "exhibition" series (as they considered it).
The Giants maintained that the rules for the World Series were haphazardly defined. In the 1903 Series, as well as the postseason series between the National League and the American Association in the 1880s, the rules for a given season's "World's Championship Series" had been whatever the two participating clubs had agreed upon. The World Series was not a compulsory event and was not governed by an authoritative body, thus the Giants were free to refuse to participate in such an event.
Stung by criticism from fans and writers, Brush in January 1905 drafted rules that both leagues adopted that winter. The rules compelled the two winning clubs to participate and governed the annual determination of sites, dates, ticket prices and division of receipts. These new rules essentially made the World Series the premier annual Major League Baseball event.
Boston slumped in 1905, while New York repeated its NL championship and won the 1905 World Series against the Philadelphia Athletics. The Series has been played every year since except 1994, when the 232-day players' strike ended the season in mid-August.