Every year, one American League (AL) team wins the pennant, representing that they are the league’s winner and have the right to play at the World Series against the champion of the National League. The pennant was introduced to the team with the win–loss album every year through the 1968 season, after which the American League Championship Series (ALCS) was released to pick on the pennant winner. The very first modern World Series was played in 1903 and, after a hiatus in 1904, has taken place every season except 1994, when a players’ strike forced the cancellation of this postseason. The American League pennant holders that are existing would be the Boston Red Sox who won in October 2018.
In 1969, the team split into two branches, along with the groups with the top records in each division played another in the five-game ALCS to find out the pennant winner, who received (and continues to receive) the William Harridge Trophy. The trophy featured a gold eagle, the league’s logo, sitting atop a silver baseball and clutching the American League banner.  the trophy is silver with a pennant on top. The prize is named Will Harridge, that was league president from 1931 to 1958. The format of the ALCS was changed from a best-of-five to a best-of-seven format in the 1985 postseason. Back in 1995, an extra playoff series was added when Major League Baseball restructured into three divisions in each league. As of 2010, the winners of the Eastern, Central, and Western Divisions, as well as the AL Wild Card winner, play in the American League Division Series, a best-of-five playoff to determine the opponents who will play in the ALCS. American League pennant winners have gone on to win the World Series 66 times, most recently in 2018.
The New York Yankees have won 40 AL pennants, winning their first in 1921 and their most recent in 2009. This total is more than double that of the next-closest team, the Oakland Athletics, who have won 15. They are accompanied closely by the Boston Red Sox and the Detroit Tigers, with 14 and 11 pennants won respectively. The Yankees have the maximum pennants because the introduction of the ALCS in 1969 with 11, followed with the Athletics and the Baltimore Orioles with 6 and 5 respectively. The Yankees also hold the record for most wins by a pennant-winning group, with their 1998 team winning 114 from 162 games, finishing 22 games before the Boston Red Sox. The 1954 Cleveland Indians won the most games of any pennant winner under the pre-1969 system, winning 111 out of their 154 games and completing eight games ahead of the Yankees. The Milwaukee Brewers won the American League pennant in 1982 but afterwards moved into the National League starting in the 1998 season.
The only American League team to have won a pennant is that the Seattle Mariners
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