American League

American League
Sport	Baseball
Founded	January 28, 1901 in Milwaukee, Wisconsin
Founder	Ban Johnson
President	vacant (honorary)
Divisions	3
No. of teams	15
Countries	United States (14 teams); Canada (1 team);
Most recent; champion(s)	Texas Rangers (3rd title)
Most titles	New York Yankees (40)

The American League of Professional Baseball Clubs, known simply as the American League (AL), is the younger of two leagues constituting Major League Baseball (MLB) in the United States and Canada. It developed from the Western League, a minor league based in the Great Lakes states, which eventually aspired to major league status. It is sometimes called the Junior Circuit because it claimed Major League status for the 1901 season, 25 years after the formation of the National League (the "Senior Circuit").

Since 1903, the American League champion has played in the World Series against the National League champion with only two exceptions: 1904, when the NL champion New York Giants refused to play their AL counterpart, and 1994, when a players' strike resulted in the cancellation of the Series. Through 2023, American League teams have won 68 of the 119 World Series played since 1903. The New York Yankees have won 27 World Series and 40 American League titles, the most in major league history. The Philadelphia/Kansas City/Oakland Athletics have won the second most AL titles with 15, followed by the Boston Red Sox with 14.

For decades, Major League baseball clubs only played teams from their own league during the regular season and playoffs, with only the two pennant winners meeting in the World Series. The AL and NL also employed and trained their own umpires, who only worked regular season games in their own league. These differences resulted in the leagues developing slightly different strategies and styles of play. The American League was usually regarded as the less "traditional" league during the 20th century, a reputation most exemplified by the introduction of the designated hitter rule in 1973, which encouraged AL managers to largely abandon "smallball" tactics. However, with the advent of free agency in the 1970s allowing for more player movement between leagues, the introduction of regular season interleague play in 1997, umpires working games across MLB beginning in 1999, and the NL's adoption of the designated hitter rule in 2022, the difference in play between the two major leagues has diminished considerably.

Though both leagues agreed to be jointly governed by a commissioner in 1920, they remained separate business entities with their own presidents and management. This was the case until after the 1999 season, when the American League legally merged with the National League under the auspices of Major League Baseball, which now operates much like other North American professional sports leagues, albeit with two "leagues" instead of "conferences".