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The American League of Professional Baseball Clubs, known simply as the American League (AL), is the younger of two leagues constituting
Major League Baseball Major League Baseball (MLB) is a professional baseball league composed of 30 teams, divided equally between the National League (baseball), National League (NL) and the American League (AL), with 29 in the United States and 1 in Canada. MLB i ...
(MLB) in the
United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
and
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. 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 National League often refers to: *National League (baseball), one of the two baseball leagues constituting Major League Baseball in the United States and Canada *National League (division), the fifth division of the English football (soccer) system ...
(the "Senior Circuit"). Since 1903, the American League champion has played in the
World Series The World Series is the annual championship series of Major League Baseball (MLB). It has been contested since between the champion teams of the American League (AL) and the National League (NL). The winning team, determined through a best- ...
against the National League champion with only two exceptions: 1904, when the NL champion
New York Giants The New York Giants are a professional American football team based in the New York metropolitan area. The Giants compete in the National Football League (NFL) as a member of the National Football Conference (NFC) NFC East, East division. The ...
refused to play their AL counterpart, and 1994, when a players' strike resulted in the cancellation of the Series. Through 2024, American League teams have won 68 of the 120 World Series played since 1903. The
New York Yankees The New York Yankees are an American professional baseball team based in the Boroughs of New York City, New York City borough of the Bronx. The Yankees compete in Major League Baseball (MLB) as a member club of the American League (AL) Am ...
have won 27 World Series and 41 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 The Boston Red Sox are an American professional baseball team based in Boston. The Red Sox compete in Major League Baseball (MLB) as a member club of the American League (AL) American League East, East Division. Founded in as one of the Ameri ...
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 The designated hitter (DH) is a baseball player who bats in place of another position player, most commonly the pitcher. Unlike other players in a team's lineup, they generally only play as an offensive player and usually do not play defense as ...
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 Interleague play in Major League Baseball refers to regular-season baseball games played between an American League (AL) team and a National League (NL) team. Interleague play was first introduced during the 1997 Major League Baseball season. ...
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 A commissioner (commonly abbreviated as Comm'r) is, in principle, a member of a commission or an individual who has been given a commission (official charge or authority to do something). In practice, the title of commissioner has evolved to incl ...
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".


History

Originally a
minor league Minor leagues are professional sports leagues which are not regarded as the premier leagues in those sports. Minor league teams tend to play in smaller, less elaborate venues, often competing in smaller cities/markets. This term is used in Nort ...
known as the Western League, which existed from 1885 to 1899 with teams in mostly
Great Lakes The Great Lakes, also called the Great Lakes of North America, are a series of large interconnected freshwater lakes spanning the Canada–United States border. The five lakes are Lake Superior, Superior, Lake Michigan, Michigan, Lake Huron, H ...
states, the league changed its name to the American League for the 1900 season and the next year developed into a second major league as a competitor to the older
National League National League often refers to: *National League (baseball), one of the two baseball leagues constituting Major League Baseball in the United States and Canada *National League (division), the fifth division of the English football (soccer) system ...
. This was prompted by the NL dropping four teams following the 1899 season after having absorbed its previous rival, the American Association, which disbanded in 1891 after ten seasons. In its early history of the late 1880s, the minor Western League struggled until 1894, when
Ban Johnson Byron Bancroft "Ban" Johnson (January 5, 1864 – March 28, 1931) was an American executive in professional baseball who served as the founder and first president of the American League (AL). Johnson developed the AL—a descendant of th ...
became the president of the league. Johnson pushed the league to rise to major league status, after the name change to the American League was decided in a league meeting in
Milwaukee, Wisconsin Milwaukee is the List of cities in Wisconsin, most populous city in the U.S. state of Wisconsin. Located on the western shore of Lake Michigan, it is the List of United States cities by population, 31st-most populous city in the United States ...
, at the former Republican Hotel. A historical marker is at the intersection of North Dr. Martin Luther King Jr. Drive and West Kilbourn Avenue where the hotel once stood. In March 1904, Johnson moved the league's headquarters from Chicago to New York.
Babe Ruth George Herman "Babe" Ruth (February 6, 1895 – August 16, 1948) was an American professional Baseball in the United States, baseball player whose career in Major League Baseball (MLB) spanned 22 seasons, from 1914 through 1935. Nickna ...
, noted as one of the most prolific hitters in
Major League Baseball Major League Baseball (MLB) is a professional baseball league composed of 30 teams, divided equally between the National League (baseball), National League (NL) and the American League (AL), with 29 in the United States and 1 in Canada. MLB i ...
history, spent the majority of his career in the American League with the
Boston Red Sox The Boston Red Sox are an American professional baseball team based in Boston. The Red Sox compete in Major League Baseball (MLB) as a member club of the American League (AL) American League East, East Division. Founded in as one of the Ameri ...
and the
New York Yankees The New York Yankees are an American professional baseball team based in the Boroughs of New York City, New York City borough of the Bronx. The Yankees compete in Major League Baseball (MLB) as a member club of the American League (AL) Am ...
. From 1973 to 2022 The American League had one notable difference versus the rival
National League National League often refers to: *National League (baseball), one of the two baseball leagues constituting Major League Baseball in the United States and Canada *National League (division), the fifth division of the English football (soccer) system ...
, as it had the
designated hitter The designated hitter (DH) is a baseball player who bats in place of another position player, most commonly the pitcher. Unlike other players in a team's lineup, they generally only play as an offensive player and usually do not play defense as ...
rule. Under the rule, a team may use a batter in its lineup who is not in the field defensively, replacing the
pitcher In baseball, the pitcher is the player who throws ("Pitch (baseball), pitches") the Baseball (ball), baseball from the pitcher's mound toward the catcher to begin each play, with the goal of out (baseball), retiring a batter (baseball), batter, ...
in the batting order, compared to the old rule that made it mandatory for the pitcher to bat. In the last two decades, the season schedule has allowed occasional interleague play. In 1969, the AL (and NL) were divided into East and West divisions, with a postseason playoff series for the pennant and the right to play in the World Series. Until the late 1970s, league umpires working behind home plate wore large, balloon-style chest protectors worn outside the shirt or coat, while their colleagues in the National League wore chest protectors inside the shirt or coat. In 1977, new umpires (including Steve Palermo) had to wear the inside chest protector, although those on staff wearing the outside protector could continue to do so. Most umpires made the switch to the inside protector, led by Don Denkinger in 1975 and Jim Evans the next year, although several did not, including Bill Haller, Russ Goetz, George Maloney, Bill Kunkel and Jerry Neudecker, who became the last full-time MLB umpire to use the outside protector in 1985. In 1994, the league, along with the National League, reorganized again, this time into three divisions (East, West, and Central) and added a third round to the playoffs in the form of the American League Division Series, with the best second-place team advancing to the playoffs as a wild-card team, in addition to the three divisional champions. In 1998, the newly franchised Tampa Bay Devil Rays joined the league, and the
Arizona Diamondbacks The Arizona Diamondbacks are an American professional baseball team based in Phoenix, Arizona. The Diamondbacks compete in Major League Baseball (MLB) as a member club of the National League (NL) West Division. The franchise was established ...
joined the National League: i.e., each league added a fifteenth team. An odd number of teams per league meant that at least one team in each league would have to be idle on any given day, or alternatively, that odd team out would have had to play an interleague game against its counterpart in the other league. The initial plan was to have three five-team divisions per league with inter-league play year-round—possibly as many as 30 interleague games per team each year. For various reasons, it soon seemed more practical to have an even number of teams in both leagues. The
Milwaukee Brewers The Milwaukee Brewers are an American professional baseball team based in Milwaukee. The Brewers compete in Major League Baseball (MLB) as a member club of the National League (baseball), National League (NL) National League Central, Central Di ...
agreed to change leagues to become the National League's 16th team, moving from the AL Central to the NL Central. At the same time, the
Detroit Tigers The Detroit Tigers are an American professional baseball team based in Detroit. The Tigers compete in Major League Baseball (MLB) as a member club of the American League (AL) American League Central, Central Division. One of the AL's eight chart ...
were moved from the AL East to the AL Central, making room for the Devil Rays in the East. Even after expansion, the American League then continued with 14 teams. This situation changed again in 2013 when the
Houston Astros The Houston Astros are an American professional baseball team based in Houston. The Astros compete in Major League Baseball (MLB) as a member club of the American League (AL) American League West, West Division. They are one of two major leag ...
moved from the National League Central division to the American League West. The Astros had been in the NL for 51 years since beginning as an expansion team in 1962. Since their move, both leagues now consist of 15 teams.


Interleague play, and merger

For the first 96 years, American League teams faced their National League counterparts only in exhibition games or in the World Series. Beginning in 1997, interleague games have been played during the regular season and count in the standings. As part of the agreement instituting interleague play, the designated-hitter rule was used only in games where the American League team is the home team, until the 2022 season, when the universal DH rule was implemented. In 2023, American League teams played 46 regular season interleague games against all 15 National League teams, 23 at home and 23 on the road. In 2000, the American League ended its status as a legally independent entity when the American and National Leagues were both merged into the legal entity Major League Baseball (MLB). This left MLB as a single league, divided into two parts, also called leagues. This change in legal status had no effect on play, scheduling, and so forth.


Teams


Charter franchises

There were eight charter teams in 1901, the league's first year as a major league, and the next year the original
Milwaukee Brewers The Milwaukee Brewers are an American professional baseball team based in Milwaukee. The Brewers compete in Major League Baseball (MLB) as a member club of the National League (baseball), National League (NL) National League Central, Central Di ...
(not to be confused with the current
Milwaukee Brewers The Milwaukee Brewers are an American professional baseball team based in Milwaukee. The Brewers compete in Major League Baseball (MLB) as a member club of the National League (baseball), National League (NL) National League Central, Central Di ...
) moved to St. Louis to become the St. Louis Browns, and the year after the
New York Highlanders The New York Yankees are an American professional baseball team based in the New York City borough of the Bronx. The Yankees compete in Major League Baseball (MLB) as a member club of the American League (AL) East Division. They are one ...
replaced the disbanded original Baltimore Orioles. Those eight franchises constituted the league for 52 seasons until the Browns moved to Baltimore and took up the Orioles name. The eight original teams and their counterparts in the "Classic Eight" were: *Original
Baltimore Orioles The Baltimore Orioles (also known as the O's) are an American professional baseball team based in Baltimore. The Orioles compete in Major League Baseball (MLB) as a member club of the American League (AL) East Division. As one of the America ...
(not to be confused with the current
Baltimore Orioles The Baltimore Orioles (also known as the O's) are an American professional baseball team based in Baltimore. The Orioles compete in Major League Baseball (MLB) as a member club of the American League (AL) East Division. As one of the America ...
, see Milwaukee Brewers) folded after the 1902 season, and was replaced by the New York team that began play in 1903. The New York franchise was nicknamed "Highlanders", "Americans", and " Yankees" until the latter became official in 1913. *Boston Americans (became the
Boston Red Sox The Boston Red Sox are an American professional baseball team based in Boston. The Red Sox compete in Major League Baseball (MLB) as a member club of the American League (AL) American League East, East Division. Founded in as one of the Ameri ...
in 1908) * Chicago White Stockings (name shortened to White Sox in 1904) * Cleveland Blues (became the
Cleveland Indians The Cleveland Guardians are an American professional baseball team based in Cleveland. The Guardians compete in Major League Baseball (MLB) as a member club of the American League (AL) American League Central, Central Division. Since , the team ...
in 1915 and the
Cleveland Guardians The Cleveland Guardians are an American professional baseball team based in Cleveland. The Guardians compete in Major League Baseball (MLB) as a member club of the American League (AL) Central Division. Since , the team has played its home gam ...
in 2022) *
Detroit Tigers The Detroit Tigers are an American professional baseball team based in Detroit. The Tigers compete in Major League Baseball (MLB) as a member club of the American League (AL) American League Central, Central Division. One of the AL's eight chart ...
(name and locale unchanged from 1894 forward) *Original
Milwaukee Brewers The Milwaukee Brewers are an American professional baseball team based in Milwaukee. The Brewers compete in Major League Baseball (MLB) as a member club of the National League (baseball), National League (NL) National League Central, Central Di ...
(became the St. Louis Browns in 1902 and the current
Baltimore Orioles The Baltimore Orioles (also known as the O's) are an American professional baseball team based in Baltimore. The Orioles compete in Major League Baseball (MLB) as a member club of the American League (AL) East Division. As one of the America ...
in 1954) *
Philadelphia Athletics The Philadelphia Athletics were a Major League Baseball team that played in Philadelphia from 1901 to 1954, when they moved to Kansas City, Missouri, and became the Kansas City Athletics. Following another move in 1967, they became the Oakland ...
(became the
Kansas City Athletics The Kansas City Athletics were a Major League Baseball team that played in Kansas City, Missouri, from 1955 to 1967, having previously played in Philadelphia, Pennsylvania, as the Philadelphia Athletics. After moving in 1967, the team became the ...
in 1955, the
Oakland Athletics The Oakland Athletics (frequently referred to as the Oakland A's) were an American Major League Baseball (MLB) team based in Oakland, California from 1968 to 2024. The Athletics were a member club of the American League (AL) American League We ...
in 1968, and the Athletics in 2025) *Original Washington Senators (became the
Minnesota Twins The Minnesota Twins are an American professional baseball team based in Minneapolis. The Twins compete in Major League Baseball (MLB) as a member club of the American League (AL) American League Central, Central Division. The team is named afte ...
in 1961)


Expansion, renaming, and relocation summary

*1902: Original
Milwaukee Brewers The Milwaukee Brewers are an American professional baseball team based in Milwaukee. The Brewers compete in Major League Baseball (MLB) as a member club of the National League (baseball), National League (NL) National League Central, Central Di ...
moved to St. Louis, renamed St. Louis Browns *1902: Cleveland Bluebirds/Blues players attempted to adopt the nickname Cleveland Bronchos, which failed to catch on *1903:
New York Highlanders The New York Yankees are an American professional baseball team based in the New York City borough of the Bronx. The Yankees compete in Major League Baseball (MLB) as a member club of the American League (AL) East Division. They are one ...
replaced original Baltimore Orioles; dubbed "Highlanders" by press after their field, Hilltop Park, and "Yankees" as an alternate form of "Americans" *1903: Chicago White Stockings officially renamed
Chicago White Sox The Chicago White Sox are an American professional baseball team based in Chicago. The White Sox compete in Major League Baseball (MLB) as a member club of the American League (AL) American League Central, Central Division. The club plays its ...
*1903: Cleveland Blues/Bronchos renamed
Cleveland Naps The Cleveland Guardians are an American professional baseball team based in Cleveland. The Guardians compete in Major League Baseball (MLB) as a member club of the American League (AL) Central Division. Since , the team has played its home gam ...
via newspaper poll, after star
Nap Lajoie Napoléon Lajoie (; September 5, 1874 – February 7, 1959), also known as Larry Lajoie, was an American professional baseball second baseman who played 21 seasons in Major League Baseball (MLB). Nicknamed "the Frenchman", he represented both Ph ...
*1905: Washington Senators renamed
Washington Nationals The Washington Nationals are an American professional baseball team based in Washington, D.C. The Nationals compete in Major League Baseball (MLB) as a member club of the National League (NL) East Division. They play their home games at Na ...
; Senators name continued to be used by media *1908:
Boston Americans The Boston Red Sox are an American professional baseball team based in Boston. The Red Sox compete in Major League Baseball (MLB) as a member club of the American League (AL) American League East, East Division. Founded in as one of the Ameri ...
(informal nickname) formally named
Boston Red Sox The Boston Red Sox are an American professional baseball team based in Boston. The Red Sox compete in Major League Baseball (MLB) as a member club of the American League (AL) American League East, East Division. Founded in as one of the Ameri ...
*1913:
New York Highlanders The New York Yankees are an American professional baseball team based in the New York City borough of the Bronx. The Yankees compete in Major League Baseball (MLB) as a member club of the American League (AL) East Division. They are one ...
nickname dropped in favor of already-established alternative,
New York Yankees The New York Yankees are an American professional baseball team based in the Boroughs of New York City, New York City borough of the Bronx. The Yankees compete in Major League Baseball (MLB) as a member club of the American League (AL) Am ...
*1915:
Cleveland Naps The Cleveland Guardians are an American professional baseball team based in Cleveland. The Guardians compete in Major League Baseball (MLB) as a member club of the American League (AL) Central Division. Since , the team has played its home gam ...
renamed
Cleveland Indians The Cleveland Guardians are an American professional baseball team based in Cleveland. The Guardians compete in Major League Baseball (MLB) as a member club of the American League (AL) American League Central, Central Division. Since , the team ...
*1954: St. Louis Browns move to Baltimore, renamed
Baltimore Orioles The Baltimore Orioles (also known as the O's) are an American professional baseball team based in Baltimore. The Orioles compete in Major League Baseball (MLB) as a member club of the American League (AL) East Division. As one of the America ...
*1955:
Philadelphia Athletics The Philadelphia Athletics were a Major League Baseball team that played in Philadelphia from 1901 to 1954, when they moved to Kansas City, Missouri, and became the Kansas City Athletics. Following another move in 1967, they became the Oakland ...
move to Kansas City *1957: Washington Nationals/Senators formally renamed Washington Senators *1961: Washington Senators move to Minneapolis-St. Paul, renamed
Minnesota Twins The Minnesota Twins are an American professional baseball team based in Minneapolis. The Twins compete in Major League Baseball (MLB) as a member club of the American League (AL) American League Central, Central Division. The team is named afte ...
*1961:
Los Angeles Angels The Los Angeles Angels are an American professional baseball team based in the Greater Los Angeles, Greater Los Angeles area. The Angels compete in Major League Baseball (MLB) as a member club of the American League (AL) American League West, ...
and ''new'' Washington Senators enfranchised. *1965:
Los Angeles Angels The Los Angeles Angels are an American professional baseball team based in the Greater Los Angeles, Greater Los Angeles area. The Angels compete in Major League Baseball (MLB) as a member club of the American League (AL) American League West, ...
renamed
California Angels The Los Angeles Angels are an American professional baseball team based in the Greater Los Angeles area. The Angels compete in Major League Baseball (MLB) as a member club of the American League (AL) West Division. Since 1966, the team has pl ...
in late-season on September 2, 1965. For the following season, the Angels moved within the Los Angeles metropolitan area from the city of Los Angeles to the Orange County suburb of Anaheim. *1968:
Kansas City Athletics The Kansas City Athletics were a Major League Baseball team that played in Kansas City, Missouri, from 1955 to 1967, having previously played in Philadelphia, Pennsylvania, as the Philadelphia Athletics. After moving in 1967, the team became the ...
move to Oakland *1969:
Kansas City Royals The Kansas City Royals are an American professional baseball team based in Kansas City, Missouri. The Royals compete in Major League Baseball (MLB) as a member club of the American League (AL) American League Central, Central Division. The team ...
and
Seattle Pilots The Seattle Pilots were an American professional baseball team based in Seattle, Washington, during the 1969 Major League Baseball season. During their single-season existence, the Pilots played their home games at Sick's Stadium and were a me ...
enfranchised. *1970:
Seattle Pilots The Seattle Pilots were an American professional baseball team based in Seattle, Washington, during the 1969 Major League Baseball season. During their single-season existence, the Pilots played their home games at Sick's Stadium and were a me ...
move to Milwaukee, renamed
Milwaukee Brewers The Milwaukee Brewers are an American professional baseball team based in Milwaukee. The Brewers compete in Major League Baseball (MLB) as a member club of the National League (baseball), National League (NL) National League Central, Central Di ...
. (Four years earlier, in 1966, the National League's Milwaukee Braves had moved to Atlanta.) *1972: Washington Senators move to the
Dallas–Fort Worth metroplex The Dallas–Fort Worth metroplex, officially designated Dallas–Fort Worth–Arlington by the U.S. Office of Management and Budget, is the most populous metropolitan statistical area in the U.S. state of Texas and the Southern United States, ...
, renamed Texas Rangers *1973:
Oakland Athletics The Oakland Athletics (frequently referred to as the Oakland A's) were an American Major League Baseball (MLB) team based in Oakland, California from 1968 to 2024. The Athletics were a member club of the American League (AL) American League We ...
renamed
Oakland A's Oakland is a city in the East Bay region of the San Francisco Bay Area in the U.S. state of California. It is the county seat and most populous city in Alameda County, California, Alameda County, with a population of 440,646 in 2020. A major We ...
*1977:
Seattle Mariners The Seattle Mariners are an American professional baseball team based in Seattle. The Mariners compete in Major League Baseball (MLB) as a member club of the American League (AL) American League West, West Division. The team joined the American ...
and
Toronto Blue Jays The Toronto Blue Jays are a Canadian professional baseball team based in Toronto. The Blue Jays compete in Major League Baseball (MLB) as a member club of the American League (AL) American League East, East Division. Since 1989, the team has p ...
enfranchised *1980:
Oakland A's Oakland is a city in the East Bay region of the San Francisco Bay Area in the U.S. state of California. It is the county seat and most populous city in Alameda County, California, Alameda County, with a population of 440,646 in 2020. A major We ...
officially renamed
Oakland Athletics The Oakland Athletics (frequently referred to as the Oakland A's) were an American Major League Baseball (MLB) team based in Oakland, California from 1968 to 2024. The Athletics were a member club of the American League (AL) American League We ...
*1997:
California Angels The Los Angeles Angels are an American professional baseball team based in the Greater Los Angeles area. The Angels compete in Major League Baseball (MLB) as a member club of the American League (AL) West Division. Since 1966, the team has pl ...
renamed Anaheim Angels. The change came more than 30 years after the team's move to Anaheim. *1998: Tampa Bay Devil Rays, representing Tampa-St. Petersburg, enfranchised *1998:
Milwaukee Brewers The Milwaukee Brewers are an American professional baseball team based in Milwaukee. The Brewers compete in Major League Baseball (MLB) as a member club of the National League (baseball), National League (NL) National League Central, Central Di ...
transfer from the American League to the National League. (See above.) *2005: Anaheim Angels renamed
Los Angeles Angels of Anaheim The Los Angeles Angels are an American professional baseball team based in the Greater Los Angeles area. The Angels compete in Major League Baseball (MLB) as a member club of the American League (AL) West Division. Since 1966, the team has pl ...
*2008: Tampa Bay Devil Rays renamed
Tampa Bay Rays The Tampa Bay Rays are an American professional baseball team based in the Tampa Bay area. The Rays compete in Major League Baseball (MLB) as a member club of the American League (AL) American League East, East Division. They are one of two major ...
*2013:
Houston Astros The Houston Astros are an American professional baseball team based in Houston. The Astros compete in Major League Baseball (MLB) as a member club of the American League (AL) American League West, West Division. They are one of two major leag ...
moved from the National League. *2016:
Los Angeles Angels of Anaheim The Los Angeles Angels are an American professional baseball team based in the Greater Los Angeles area. The Angels compete in Major League Baseball (MLB) as a member club of the American League (AL) West Division. Since 1966, the team has pl ...
renamed
Los Angeles Angels The Los Angeles Angels are an American professional baseball team based in the Greater Los Angeles, Greater Los Angeles area. The Angels compete in Major League Baseball (MLB) as a member club of the American League (AL) American League West, ...
*2022:
Cleveland Indians The Cleveland Guardians are an American professional baseball team based in Cleveland. The Guardians compete in Major League Baseball (MLB) as a member club of the American League (AL) American League Central, Central Division. Since , the team ...
renamed
Cleveland Guardians The Cleveland Guardians are an American professional baseball team based in Cleveland. The Guardians compete in Major League Baseball (MLB) as a member club of the American League (AL) Central Division. Since , the team has played its home gam ...
*2025:
Oakland Athletics The Oakland Athletics (frequently referred to as the Oakland A's) were an American Major League Baseball (MLB) team based in Oakland, California from 1968 to 2024. The Athletics were a member club of the American League (AL) American League We ...
renamed Athletics following temporary relocation to
West Sacramento, California West Sacramento (also known as West Sac) is a city in Yolo County, California, United States. The city is separated from Sacramento, California, Sacramento by the Sacramento River, which also separates Sacramento County, California, Sacramento a ...


Current teams


American League East

*
Baltimore Orioles The Baltimore Orioles (also known as the O's) are an American professional baseball team based in Baltimore. The Orioles compete in Major League Baseball (MLB) as a member club of the American League (AL) East Division. As one of the America ...
enfranchised 1901 as the Milwaukee Brewers, moved to St. Louis (1902) and to Baltimore (1954) *
Boston Red Sox The Boston Red Sox are an American professional baseball team based in Boston. The Red Sox compete in Major League Baseball (MLB) as a member club of the American League (AL) American League East, East Division. Founded in as one of the Ameri ...
enfranchised 1901, nicknamed the Americans (adopted name Red Sox in 1908) *
New York Yankees The New York Yankees are an American professional baseball team based in the Boroughs of New York City, New York City borough of the Bronx. The Yankees compete in Major League Baseball (MLB) as a member club of the American League (AL) Am ...
enfranchised 1903, replacing the original Baltimore Orioles, nicknamed the Highlanders ("Highlanders" dropped out of use after move to the
Polo Grounds The Polo Grounds was the name of three stadiums in Upper Manhattan, New York City, used mainly for professional baseball and American football from 1880 to 1963. The original Polo Grounds, opened in 1876 and demolished in 1889, was built for the ...
in 1913; officially adopted alternate nickname Yanks/Yankees by 1923)Sources recently have dissociated the 1902–1903 Baltimore Orioles from the Highlanders/Yankees
Sports Reference.com
and sources cited on that page. Retrieved July 23, 2014.
*
Tampa Bay Rays The Tampa Bay Rays are an American professional baseball team based in the Tampa Bay area. The Rays compete in Major League Baseball (MLB) as a member club of the American League (AL) American League East, East Division. They are one of two major ...
enfranchised 1998 as the Tampa Bay Devil Rays (team name changed in 2008) *
Toronto Blue Jays The Toronto Blue Jays are a Canadian professional baseball team based in Toronto. The Blue Jays compete in Major League Baseball (MLB) as a member club of the American League (AL) American League East, East Division. Since 1989, the team has p ...
enfranchised 1977


American League Central

*
Chicago White Sox The Chicago White Sox are an American professional baseball team based in Chicago. The White Sox compete in Major League Baseball (MLB) as a member club of the American League (AL) American League Central, Central Division. The club plays its ...
enfranchised 1894 as the Sioux City Cornhuskers, moved to St. Paul (1895) and to Chicago (1900) *
Cleveland Guardians The Cleveland Guardians are an American professional baseball team based in Cleveland. The Guardians compete in Major League Baseball (MLB) as a member club of the American League (AL) Central Division. Since , the team has played its home gam ...
enfranchised 1896 as the Columbus Buckeyes, moved to Grand Rapids (July 1899) and to Cleveland (1900) *
Detroit Tigers The Detroit Tigers are an American professional baseball team based in Detroit. The Tigers compete in Major League Baseball (MLB) as a member club of the American League (AL) American League Central, Central Division. One of the AL's eight chart ...
enfranchised 1894 *
Kansas City Royals The Kansas City Royals are an American professional baseball team based in Kansas City, Missouri. The Royals compete in Major League Baseball (MLB) as a member club of the American League (AL) American League Central, Central Division. The team ...
enfranchised 1969 *
Minnesota Twins The Minnesota Twins are an American professional baseball team based in Minneapolis. The Twins compete in Major League Baseball (MLB) as a member club of the American League (AL) American League Central, Central Division. The team is named afte ...
enfranchised 1894 as the Kansas City Blues, moved to Washington (1901), and to Minneapolis-St. Paul (1961)


American League West

* Athletics enfranchised 1901 in Philadelphia, moved to Kansas City (1955), Oakland (1968), and to West Sacramento (2025) *
Houston Astros The Houston Astros are an American professional baseball team based in Houston. The Astros compete in Major League Baseball (MLB) as a member club of the American League (AL) American League West, West Division. They are one of two major leag ...
enfranchised 1962 in National League as the Houston Colt .45s (team changed name to Astros in 1965), transferred to American League (2013) *
Los Angeles Angels The Los Angeles Angels are an American professional baseball team based in the Greater Los Angeles, Greater Los Angeles area. The Angels compete in Major League Baseball (MLB) as a member club of the American League (AL) American League West, ...
enfranchised 1961 as the Los Angeles Angels, then as the California Angels after moving to Anaheim (1966), then the Anaheim Angels (1997), then the Los Angeles Angels of Anaheim (2005). This last remains the ''legal'' name of the franchise, but in actual practice, the team is known as the Los Angeles Angels, officially so since 2016 *
Seattle Mariners The Seattle Mariners are an American professional baseball team based in Seattle. The Mariners compete in Major League Baseball (MLB) as a member club of the American League (AL) American League West, West Division. The team joined the American ...
enfranchised 1977 * Texas Rangers enfranchised 1961 as the Washington Senators, moved to the
Dallas–Fort Worth metroplex The Dallas–Fort Worth metroplex, officially designated Dallas–Fort Worth–Arlington by the U.S. Office of Management and Budget, is the most populous metropolitan statistical area in the U.S. state of Texas and the Southern United States, ...
(1972)


Timeline

The first line is the transformation of the
American League The American League of Professional Baseball Clubs, known simply as the American League (AL), is the younger of two sports leagues, leagues constituting Major League Baseball (MLB) in the United States and Canada. It developed from the Western L ...
(AL) to a major league in 1901. The second line is the beginning of the expansion era in 1961. The third line marks the legal merger of the American and National Leagues into a single
Major League Baseball Major League Baseball (MLB) is a professional baseball league composed of 30 teams, divided equally between the National League (baseball), National League (NL) and the American League (AL), with 29 in the United States and 1 in Canada. MLB i ...
in 2000.
World Series The World Series is the annual championship series of Major League Baseball (MLB). It has been contested since between the champion teams of the American League (AL) and the National League (NL). The winning team, determined through a best- ...
championships are shown with a "•", American League Pennants before the World Series are shown with a "#", and American League Pennants who lost the World Series are shown with a "^". No World Series was played in 1904, so the pennant winners for each league are indicated. Due to the 1994–95 Major League Baseball strike, there were no pennant or World Series winners in 1994, so this year is left blank. DateFormat = yyyy ImageSize = width:948 height:auto barincrement:25 PlotArea = left:0 right:50 bottom:20 top:20 Colors = id:majorGridColor value:rgb(0.9,0.9,0.9) id:lineColor value:gray(0.6) id:nl1 value:gray(0.9) id:inactive value:gray(0.5) id:gold value:rgb(0.99,0.72,0.15) id:brown value:rgb(0.36,0.20,0.10) id:vegasgold value:rgb(0.80,0.72,0.49) id:green value:rgb(0,0.51,0.28) id:darkgreen value:rgb(0,0.20,0) id:orange value:rgb(1,0.39,0) id:redorange value:rgb(1,0.23,0) id:red value:rgb(0.80,0.01,0.07) id:red2 value:rgb(0.90,0.01,0.07) id:darkred value:rgb(0.50,0,0) id:iceblue value:rgb(0.20,0.60,0.80) id:lgray value:gray(0.1) id:gray value:gray(0.3) id:gray2 value:gray(0.5) id:sand value:rgb(0.94,0.89,0.77) id:navy value:rgb(0,0,0.28) id:navy2 value:rgb(0,0,0.39) id:teal value:rgb(0,0.65,0.65) id:teal2 value:rgb(0,0.45,0.45) id:turquoise value:rgb(0,0.65,0.85) Period = from:1892 till:2026 TimeAxis = orientation:horizontal format:yyyy ScaleMajor = start:1900 increment:10 gridcolor:majorGridColor LineData = at:1901 color:lineColor #Formation of AL at:1961 color:lineColor #Expansion Era Begins at:2000 color:lineColor #Legal merger into MLB BarData = bar:BLA # Baltimore Orioles (1901–1902) bar:BOS # Boston Americans / Red Sox bar:CWS # Chicago White Sox bar:CLE # Cleveland Blues / Bronchos / Naps / Indians / Guardians bar:DET # Detroit Tigers bar:BAL # Milwaukee Brewers / St. Louis Browns / Baltimore Orioles bar:ATH # Philadelphia Athletics / Kansas City Athletics / Oakland Athletics / Athletics bar:MIN # Washington Senators / Minnesota Twins bar:NYY # New York Highlanders / Yankees bar:TEX # Washington Senators / Texas Rangers bar:LAA # Los Angeles Angels / California Angels / Anaheim Angels / Los Angeles Angels of Anaheim bar:HOU # Houston Colt .45s / Houston Astros bar:KC # Kansas City Royals bar:MIL # Seattle Pilots / Milwaukee Brewers bar:SEA # Seattle Mariners bar:TOR # Toronto Blue Jays bar:TB # Tampa Bay Devil Rays / Tampa Bay Rays Define $Up = shift:(,1) Define $Left = anchor:from align:right shift:(-1,) Define $Right = anchor:till align:left shift:(2,) Define $Right2 = anchor:till align:right shift:(-25,) Define $DownRight2 = anchor:till align:right shift:(-25,-10) Define $Down = shift:(,-10) Define $UpLeft = anchor:from align:right shift:(-1,1) Define $UpLeft2 = anchor:from align:left shift:(-1,1) Define $UpRight2 = anchor:till align:right shift:(-1,1) Define $UpRight3 = anchor:till align:right shift:(-25,1) Define $UpRight = anchor:till align:left shift:(2,1) Define $DownRight = anchor:till align:left shift:(2,-10) Define $DownLeft = anchor:from align:left shift:(2,-10) Define $UpUpRight = anchor:till align:left shift:(2,10) Define $champ = text:"•" textcolor:white fontsize:XL shift:(5,-5) Define $champ2 = text:"^" textcolor:white fontsize:L shift:(5,-5) Define $champ3 = text:"#" textcolor:white shift:(5,1) PlotData = color:inactive textcolor:black width:20 fontsize:S mark:(line,black) anchor:middle # other options are anchor:from anchor:till align:center # other options are align:left align:right shift:(0,-5) # Note on dates: A team's bar begins with the season that team played its first game, and ends with the season after that team played its last game. For example, the Cincinnati Red Stockings played their first game in 1876, the first season of the National League, and played their last game in 1880. Therefore, their bar goes from 1876 to 1881. # --- Charter Members of the American League bar:BLA from:1901 till:1903 link:/wiki/Baltimore_Orioles_(1901–1902) bar:BLA from:1901 till:1903 color:orange text:"Baltimore Orioles" $Right bar:BOS from:1901 till:end link:/wiki/Boston_Red_Sox bar:BOS from:1901 till:1908 color:darkred text:"Boston~Americans" $UpLeft bar:BOS from:1908 till:end color:red text:"Boston Red Sox" textcolor:navy $DownRight2 at:Bos at:1904 $champ3 mark:(line, darkred) at:BOS at:1903 $champ mark:(line, darkred) at:BOS at:1912 $champ mark:(line, red) at:BOS at:1915 $champ mark:(line, red) at:BOS at:1916 $champ mark:(line, red) at:BOS at:1918 $champ mark:(line, red) at:BOS at:1946 $champ2 mark:(line, red) at:BOS at:1967 $champ2 mark:(line, red) at:BOS at:1975 $champ2 mark:(line, red) at:BOS at:1986 $champ2 mark:(line, red) at:BOS at:2007 $champ mark:(line, red) at:BOS at:2004 $champ mark:(line, red) at:BOS at:2013 $champ mark:(line, red) at:BOS at:2018 $champ mark:(line, red) bar:CWS from:1901 till:end link:/wiki/Chicago_White_Sox bar:CWS from:1901 till:1904 color:navy text:"Chicago~White~Stockings" $UpLeft bar:CWS from:1904 till:end color:black text:"Chicago White Sox" textcolor:white $Right2 at:CWS at:1901 $champ3 mark:(line, black) at:CWS at:1906 $champ mark:(line, black) at:CWS at:1917 $champ mark:(line, black) at:CWS at:1919 $champ2 mark:(line, black) at:CWS at:1959 $champ2 mark:(line, black) at:CWS at:2005 $champ mark:(line, black) bar:CLE from:1901 till:end link:/wiki/Cleveland_Guardians bar:CLE from:1901 till:1902 color:darkblue text:"Cleveland~Blues" $Left bar:CLE from:1901 till:1902 color:darkblue text:"Bronchos" textcolor:white $DownLeft bar:CLE from:1902 till:1903 color:navy bar:CLE from:1903 till:1915 color:red text:"Cleveland Naps" textcolor:navy $Up bar:CLE from:1915 till:2022 color:red2 text:"Cleveland Indians" textcolor:navy bar:CLE from:2022 till:end color:red text:"Cleveland~Guardians" textcolor:navy $UpRight at:CLE at:1920 $champ mark:(line, red2) at:CLE at:1948 $champ mark:(line, red2) at:CLE at:1954 $champ2 mark:(line, red2) at:CLE at:1995 $champ2 mark:(line, red2) at:CLE at:1997 $champ2 mark:(line, red2) at:CLE at:2016 $champ2 mark:(line, red2) bar:DET from:1901 till:end link:/wiki/Detroit_Tigers bar:DET from:1901 till:end color:navy text:"Detroit Tigers" textcolor:orange $DownRight2 at:DET at:1907 $champ2 mark:(line, navy) at:DET at:1908 $champ2 mark:(line, navy) at:DET at:1909 $champ2 mark:(line, navy) at:DET at:1934 $champ2 mark:(line, navy) at:DET at:1935 $champ mark:(line, navy) at:DET at:1940 $champ2 mark:(line, navy) at:DET at:1945 $champ mark:(line, navy) at:DET at:1968 $champ mark:(line, navy) at:DET at:1984 $champ mark:(line, navy) at:DET at:2006 $champ2 mark:(line, navy) at:DET at:2012 $champ2 mark:(line, navy) bar:BAL from:1901 till:end link:/wiki/Baltimore_Orioles bar:BAL from:1901 till:1902 color:navy2 text:"Milwaukee~Brewers" $UpLeft bar:BAL from:1902 till:1954 color:brown text:"St. Louis Browns" textcolor:white bar:BAL from:1954 till:end color:orange text:"Baltimore Orioles" $Right2 at:BAL at:1944 $champ2 mark:(line, brown) at:BAL at:1966 $champ mark:(line, orange) at:BAL at:1969 $champ2 mark:(line, orange) at:BAL at:1970 $champ mark:(line, orange) at:BAL at:1971 $champ2 mark:(line, orange) at:BAL at:1979 $champ2 mark:(line, orange) at:BAL at:1983 $champ mark:(line, orange) bar:ATH from:1901 till:end link:/wiki/Athletics_(baseball) bar:ATH from:1901 till:1955 color:blue text:"Philadelphia Athletics" textcolor:vegasgold $Down bar:ATH from:1955 till:1968 color:navy text:"Kansas City~Athletics" textcolor:red $Up bar:ATH from:1968 till:2025 color:darkgreen text:"Oakland Athletics" textcolor:gold bar:ATH from:2025 till:end color:gold text:"Athletics" textcolor:darkgreen $Right at:ATH at:1902 $champ3 mark:(line, blue) at:ATH at:1905 $champ2 mark:(line, blue) at:ATH at:1910 $champ mark:(line, blue) at:ATH at:1911 $champ mark:(line, blue) at:ATH at:1913 $champ mark:(line, blue) at:ATH at:1914 $champ2 mark:(line, blue) at:ATH at:1929 $champ mark:(line, blue) at:ATH at:1930 $champ mark:(line, blue) at:ATH at:1931 $champ2 mark:(line, blue) at:ATH at:1972 $champ mark:(line, darkgreen) at:ATH at:1973 $champ mark:(line, darkgreen) at:ATH at:1974 $champ mark:(line, darkgreen) at:ATH at:1988 $champ2 mark:(line, darkgreen) at:ATH at:1989 $champ mark:(line, darkgreen) at:ATH at:1990 $champ2 mark:(line, darkgreen) bar:MIN from:1901 till:end link:/wiki/Minnesota_Twins bar:MIN from:1901 till:1961 color:darkblue text:"Washington Senators" textcolor:white $Down bar:MIN from:1961 till:end color:skyblue text:"Minnesota Twins" textcolor:red $Right2 at:MIN at:1924 $champ mark:(line, darkblue) at:MIN at:1925 $champ2 mark:(line, darkblue) at:MIN at:1933 $champ2 mark:(line, darkblue) at:MIN at:1965 $champ2 mark:(line, skyblue) at:MIN at:1987 $champ mark:(line, skyblue) at:MIN at:1991 $champ mark:(line, skyblue) # --- 1903: New York replaces Baltimore bar:NYY from:1903 till:1912 color:gray text:"New York~Highlanders" textcolor:white $Up bar:NYY from:1912 till:end color:navy text:"New York Yankees" textcolor:white $DownRight2 at:NYY at:1921 $champ2 mark:(line, navy) at:NYY at:1922 $champ2 mark:(line, navy) at:NYY at:1923 $champ mark:(line, navy) at:NYY at:1926 $champ2 mark:(line, navy) at:NYY at:1927 $champ mark:(line, navy) at:NYY at:1928 $champ mark:(line, navy) at:NYY at:1932 $champ mark:(line, navy) at:NYY at:1936 $champ mark:(line, navy) at:NYY at:1937 $champ mark:(line, navy) at:NYY at:1938 $champ mark:(line, navy) at:NYY at:1939 $champ mark:(line, navy) at:NYY at:1941 $champ mark:(line, navy) at:NYY at:1942 $champ2 mark:(line, navy) at:NYY at:1943 $champ mark:(line, navy) at:NYY at:1947 $champ mark:(line, navy) at:NYY at:1949 $champ mark:(line, navy) at:NYY at:1950 $champ mark:(line, navy) at:NYY at:1951 $champ mark:(line, navy) at:NYY at:1952 $champ mark:(line, navy) at:NYY at:1953 $champ mark:(line, navy) at:NYY at:1955 $champ2 mark:(line, navy) at:NYY at:1956 $champ mark:(line, navy) at:NYY at:1957 $champ2 mark:(line, navy) at:NYY at:1958 $champ mark:(line, navy) at:NYY at:1960 $champ2 mark:(line, navy) at:NYY at:1961 $champ mark:(line, navy) at:NYY at:1962 $champ mark:(line, navy) at:NYY at:1963 $champ2 mark:(line, navy) at:NYY at:1964 $champ2 mark:(line, navy) at:NYY at:1976 $champ2 mark:(line, navy) at:NYY at:1977 $champ mark:(line, navy) at:NYY at:1978 $champ mark:(line, navy) at:NYY at:1981 $champ2 mark:(line, navy) at:NYY at:1996 $champ mark:(line, navy) at:NYY at:1998 $champ mark:(line, navy) at:NYY at:1999 $champ mark:(line, navy) at:NYY at:2000 $champ mark:(line, navy) at:NYY at:2001 $champ2 mark:(line, navy) at:NYY at:2003 $champ2 mark:(line, navy) at:NYY at:2009 $champ mark:(line, navy) at:NYY at:2024 $champ2 mark:(line, navy) # --- 1961 Expansion bar:TEX from:1961 till:end link:/wiki/Texas_Rangers bar:TEX from:1961 till:1972 color:darkblue text:"Washington~Senators" textcolor:white $Up bar:TEX from:1972 till:end color:oceanblue text:"Texas Rangers" textcolor:darkred $DownRight2 at:TEX at:2010 $champ2 mark:(line, oceanblue) at:TEX at:2011 $champ2 mark:(line, oceanblue) at:TEX at:2023 $champ mark:(line, oceanblue) bar:LAA from:1961 till:end link:/wiki/Los_Angeles_Angels bar:LAA from:1961 till:1965 color:red text:"Los Angeles~Angels" $UpLeft bar:LAA from:1965 till:1997 color:red2 text:"California Angels" bar:LAA from:1997 till:2005 color:skyblue text:"Anaheim~Angels" $Up bar:LAA from:2005 till:2016 color:darkred text:"Los Angeles~Angels of Anaheim" textcolor:white $Up bar:LAA from:2016 till:end color:red text:"Los Angeles~Angels" textcolor:navy $Up at:LAA at:2002 $champ mark:(line, skyblue) # --- 1962 Expansion bar:HOU from:1962 till:end link:/wiki/Houston_Astros bar:HOU from:1962 till:2013 color:nl1 text:"(NL)" bar:HOU from:2013 till:end color:orange text:"Houston Astros" $Down at:HOU at:2017 $champ mark:(line, orange) at:HOU at:2019 $champ2 mark:(line, orange) at:HOU at:2021 $champ2 mark:(line, orange) at:HOU at:2022 $champ mark:(line, orange) # --- 1969 Expansion bar:KC from:1969 till:end link:/wiki/Kansas_City_Royals bar:KC from:1969 till:end color:skyblue text:"Kansas City Royals" textcolor:darkblue $DownRight2 at:KC at:1980 $champ2 mark:(line, skyblue) at:KC at:1985 $champ mark:(line, skyblue) at:KC at:2014 $champ2 mark:(line, skyblue) at:KC at:2015 $champ mark:(line, skyblue) bar:MIL from:1969 till:end link:/wiki/Milwaukee_Brewers bar:MIL from:1969 till:1970 color:darkblue text:"Seattle Pilots" $Left bar:MIL from:1970 till:1998 color:gold text:"Milwaukee Brewers" textcolor:darkblue $Down bar:MIL from:1998 till:end color:nl1 text:"(NL)" at:MIL at:1982 $champ2 mark:(line, gold) # --- 1977 Expansion bar:SEA from:1977 till:end link:/wiki/Seattle_Mariners bar:SEA from:1977 till:end color:teal2 text:"Seattle Mariners" textcolor:white $Right2 bar:TOR from:1977 till:end link:/wiki/Toronto_Blue_Jays bar:TOR from:1977 till:end color:darkblue text:"Toronto Blue Jays" textcolor:white $Right2 at:TOR at:1992 $champ mark:(line, darkblue) at:TOR at:1993 $champ mark:(line, darkblue) # --- 1998 Expansion bar:TB from:1998 till:end link:/wiki/Tampa_Bay_Rays bar:TB from:1998 till:2008 color:blue text:"Tampa Bay~Devil Rays" textcolor:white $Up bar:TB from:2008 till:end color:navy text:"Tampa Bay Rays" textcolor:skyblue $DownRight2 at:TB at:2008 $champ2 mark:(line, navy) at:TB at:2020 $champ2 mark:(line, navy)


Presidents

Following the 1999 season, the American and National Leagues were merged with Major League Baseball, and the leagues ceased to exist as business entities. The position of the American League President and National League President became honorary.


See also

*
List of American League pennant winners Every Major League Baseball (MLB) season, one American League (AL) team wins the pennant (sports), pennant, signifying that they are the league's champion and have the right to play in the World Series against the champion of the National League ...
*
American League Championship Series The American League Championship Series (ALCS) is a best-of-seven playoff and one of two League Championship Series comprising the penultimate round of Major League Baseball's (MLB) postseason. The winner of the ALCS wins the AL pennant and ...
(ALCS) * American League Division Series (ALDS) *
List of American League Wild Card winners The Major League Baseball wild card, wild card was established for Major League Baseball's playoffs in with the intention of helping the best teams that did not win their division to still have a chance to win the World Series. The restructuring ...


Notes


References


Sources

*''The National League Story'', Lee Allen, Putnam, 1961. *''The American League Story'', Lee Allen, Putnam, 1962. *''The Baseball Encyclopedia'', published by MacMillan, 1968 and later. {{Authority control * * Sports leagues established in 1901 1901 establishments in the United States Professional sports leagues in the United States