The History of The A's Baseball Team

The Athletics are one of the oldest and most decorated franchises in Major League Baseball. Founded in Philadelphia in 1901 and managed for a half century by Connie Mack, the team built two early dynasties, moved to Kansas City in 1955, moved to Oakland in 1968, and spent the following decades as a small-market club that kept reshaping the sport. Across those cities the A's have won nine World Series championships, in 1910, 1911, 1913, 1929, 1930, 1972, 1973, 1974, and 1989, produced a long line of Hall of Fame players, and gave baseball two of its most influential ideas: Charlie Finley's showmanship and Billy Beane's Moneyball. Now the franchise, branded simply as the Athletics, is relocating to Las Vegas, its fourth home city in a story that spans more than 120 years. Our running, dated A's franchise timeline tracks every milestone along the way.

The Philadelphia Athletics and the Connie Mack Era (1901 to 1954)

The Athletics were born with the American League itself. When the AL declared major league status for the 1901 season, the Philadelphia club was one of its eight charter members, run on the field and increasingly in the front office by Connie Mack. Mack would go on to manage the team through the 1950 season, a 50-year tenure that remains the longest of any manager with a single team in North American professional sports, and he eventually became the club's sole owner as well. No single person has ever been more central to one franchise.

The early rosters were stocked with stars. Second baseman Nap Lajoie jumped to the new team and hit for a famously high average in 1901, and pitchers Eddie Plank and Chief Bender anchored staffs that made the A's an immediate power. The team played its home games at Columbia Park before moving into Shibe Park in 1909, the first steel-and-concrete ballpark in the major leagues, a genuine landmark in stadium history.

The franchise's famous elephant emblem dates to these earliest years. In July 1902, New York Giants manager John McGraw dismissed the young Philadelphia club as a "white elephant" that owner Ben Shibe would lose money on. The A's embraced the insult, adopted the elephant as a mascot and logo, and then won the American League pennant that same season. The A's took another pennant in 1905 but lost the World Series to McGraw's Giants, whose ace Christy Mathewson threw three complete-game shutouts in six days, one of the greatest individual pitching performances in postseason history. That defeat set the stage for the breakthrough dynasty that followed.

The First Dynasty (1910 to 1914)

Mack's first great team broke through in 1910, winning the franchise's first World Series over the Chicago Cubs, four games to one. The A's repeated in 1911 against the New York Giants, and won a third title in 1913, again over the Giants. Our record of that breakthrough season sits on the 1910 World Series page. The run was built on Mack's celebrated "$100,000 infield" and a deep pitching staff. It ended abruptly in 1914, when Philadelphia won the pennant but was swept in the World Series by the "Miracle" Boston Braves, the first four-game sweep in Series history. Facing rising salaries and competition from the upstart Federal League, Mack broke up the team, and the A's tumbled to the bottom of the standings for years.

The Second Dynasty (1929 to 1931)

Mack rebuilt patiently through the 1920s and assembled a second juggernaut that briefly interrupted the dominance of the New York Yankees. Powered by future Hall of Famers including slugger Jimmie Foxx, outfielder Al Simmons, catcher Mickey Cochrane, and left-hander Lefty Grove, the Athletics won three straight American League pennants from 1929 to 1931. They took the World Series in 1929 over the Chicago Cubs and again in 1930 over the St. Louis Cardinals, then lost a seven-game Series to the Cardinals in 1931. The 1929 World Series championship team is widely regarded as one of the best clubs in baseball history.

Decline and Departure

The Great Depression forced Mack to sell off his stars once again, and the Athletics spent most of the next two decades as one of the American League's weakest teams. Mack finally stepped down as manager after the 1950 season at age 88. With attendance falling and the crosstown Phillies drawing the city's baseball attention, the family sold the franchise, and the Athletics left Philadelphia after the 1954 season. You can browse any season's players, from the Mack era to today, on our A's players index.

The Kansas City Years (1955 to 1967)

The Athletics moved to Kansas City for the 1955 season, playing at Municipal Stadium. The Kansas City chapter was the least successful in franchise history: the team never finished higher than sixth place in the American League and never posted a winning record in 13 seasons there. It became notorious for a string of lopsided trades that funneled talent to the New York Yankees, most infamously sending a young Roger Maris to New York, where he would break Babe Ruth's single-season home run record in 1961.

The most consequential development in Kansas City had nothing to do with the standings. In December 1960, insurance magnate Charlie Finley bought a controlling interest in the club. Finley was combative, promotional, and restless. He clashed with the league and repeatedly sought a new city, and after securing his path he moved the Athletics to Oakland for the 1968 season. The young talent the A's had been quietly stockpiling would soon make that move look like genius.

Oakland and the Charlie Finley Era (1968 to 1980)

In Oakland the Athletics moved into the Oakland-Alameda County Coliseum, the concrete multi-purpose stadium that would be the team's home for the next 57 years. For the full story of that building, see our Oakland Coliseum profile. Finley leaned hard into spectacle: green and gold uniforms, white cleats, a mule mascot named Charlie O, and a push for innovations like night World Series games. Behind the showmanship was one of the most talented young cores baseball had ever assembled.

Crucially, that core had been stockpiled during the losing Kansas City years. Finley and his scouts signed and developed the pitchers and position players who would soon dominate, so the talent that made Oakland a champion was, in effect, inherited from the franchise's bleakest era. It is a reminder that the A's have often built their best teams quietly, out of the spotlight, before the winning arrived. You can trace those rosters season by season on our A's season rosters.

The Mustache Gang Three-Peat (1972 to 1974)

The Oakland dynasty of the early 1970s is one of the great sustained runs in the sport's history. Led by slugger Reggie Jackson, ace Catfish Hunter, relief pioneer Rollie Fingers, and 1971 Most Valuable Player and Cy Young winner Vida Blue, plus stalwarts Sal Bando, Bert Campaneris, and Gene Tenace, the A's won three consecutive World Series in 1972, 1973, and 1974. They remain the only team other than the Yankees to win three straight titles. Dick Williams managed the 1972 and 1973 champions, and Alvin Dark managed the 1974 club. The 1972 World Series, a seven-game classic over the Cincinnati Reds, launched the run.

Free agency ended the dynasty as quickly as salary pressure had ended the Philadelphia teams. A landmark ruling voided Finley's contract with Catfish Hunter, making him one of the sport's first modern free agents, and the rest of the core scattered soon after. By the late 1970s the A's were again near the bottom of the standings, with attendance so thin that the Coliseum earned an unflattering nickname.

Billyball and the Return to Contention (1980 to 1982)

The Athletics are one of the oldest and most decorated franchises in Major League Baseball.

The revival began when Billy Martin took over as manager in 1980. His aggressive, running, gambling style of play was dubbed "Billyball," and it turned the young team into a contender that reached the postseason in the strike-shortened 1981 season. The signature player of that era was a homegrown outfielder who would become the greatest leadoff hitter in history: Rickey Henderson, who set the modern single-season stolen base record in 1982. Martin's approach burned out his pitching staff and faded quickly, but Henderson's emergence pointed toward the next great Oakland team.

The Bash Brothers and the 1989 Championship (1988 to 1992)

Under manager Tony La Russa and general manager Sandy Alderson, the Athletics built a powerhouse in the late 1980s. The offense was headlined by the "Bash Brothers," muscular sluggers Mark McGwire and Jose Canseco, and the bullpen was anchored by converted starter Dennis Eckersley, who redefined the modern closer role. With Rickey Henderson back atop the lineup, Oakland won three straight American League pennants from 1988 to 1990.

The World Series results were mixed. In 1988 the heavily favored A's were upset by the Los Angeles Dodgers, remembered for Kirk Gibson's walk-off home run off Eckersley. In 1990 they were swept by the Cincinnati Reds. In between came the crown of the era. In the 1989 World Series, Oakland swept the San Francisco Giants in four games, a Bay Area matchup forever marked by the magnitude 6.9 Loma Prieta earthquake that struck on October 17, 1989, just before Game 3 and forced a ten-day suspension of the Series. Our page on the 1989 World Series covers that unforgettable and somber championship. It stands as the franchise's most recent title.

Moneyball and the Billy Beane Era (1997 to 2014)

Facing one of the smallest payrolls in baseball, the Athletics reinvented how a small-market team could compete. General manager Billy Beane, working with ideas that valued on-base percentage and other undervalued skills over traditional scouting instincts, built repeated contenders on a fraction of what big-market rivals spent. That approach, popularized in Michael Lewis's 2003 book "Moneyball" and the later film, changed front offices across the sport. We trace how that philosophy still shapes the club in our feature on the Moneyball legacy.

The on-field peak came in 2002, when Oakland won 20 consecutive games from August 13 to September 4, an American League record, capped by Scott Hatteberg's walk-off home run against the Kansas City Royals. That team, fronted by the young "Big Three" starters Tim Hudson, Mark Mulder, and 2002 Cy Young winner Barry Zito, and star shortstop Miguel Tejada, won 103 games. The A's reached the playoffs regularly in this era but repeatedly fell short in October, a frustration that became part of the Moneyball story itself.

Beane's approach kept producing contenders long after the book was published. A retooled Oakland club won back-to-back American League West division titles in 2012 and 2013 and returned to the postseason as a wild card in 2014, again on one of the smallest payrolls in the sport. The pattern held true to form: strong regular seasons that ended in early playoff exits. That October ceiling, more than any lack of talent, is what the small-market A's never quite broke through in their Oakland years. To see how those same ideas travel with the franchise to the desert, read our look at the A's championship history.

The Final Oakland Years and the Move to Las Vegas

The last decade in Oakland was defined by a long, bitter fight over a new stadium. Years of failed plans for a ballpark in the Bay Area, combined with an aging Coliseum and ownership under John Fisher that drew heavy fan criticism, pushed the franchise toward relocation. The team's final manager in Oakland was Mark Kotsay. The Athletics played their last season in Oakland in 2024, ending 57 years in the city, and set course for Las Vegas.

Because the new ballpark would not be ready immediately, the franchise arranged a bridge: the team is playing interim seasons primarily at a minor league park in the Sacramento area while a permanent home rises on the Las Vegas Strip. That new stadium is being built on the site of the former Tropicana hotel and casino, with a groundbreaking in June 2025 and a target opening for the 2028 season. It is designed as a fully enclosed, climate-controlled park, a necessity in the desert heat. We cover the design, cost, and progress in depth in our Las Vegas ballpark guide and our profile of the new Las Vegas ballpark. Fans following the whole relocation should also read our fan's guide to the A's move to Las Vegas.

Timelines on a project this large can shift, and honest fans should treat the 2028 opening as the plan rather than a promise. But the direction is set, and for the first time the franchise is building something new rather than leaving something behind.

One Franchise, Four Cities

What ties this long story together is continuity of identity. The team dropped its city label in the move and is now branded simply as the Athletics, but the A's nickname, the green and gold colors, and the elephant logo all carry forward. This is the same franchise that won titles in Philadelphia under Connie Mack, in Oakland under Charlie Finley and Tony La Russa, and reshaped the sport through Moneyball. New Las Vegas fans are not adopting an expansion team, they are inheriting more than a century of one of baseball's richest histories.

That continuity also carries an emotional weight worth naming. Many longtime Oakland fans feel the relocation took something from them, and that grief is real and legitimate. Honoring the Philadelphia, Kansas City, and Oakland chapters while welcoming a Las Vegas future is not a contradiction, it is simply the honest way to be a fan of a franchise this old. The green and gold have changed cities before, and the record of what the team accomplished in each place does not disappear when the address changes.

The Bottom Line

The history of the A's is a history of reinvention. From Connie Mack's dynasties in Philadelphia, through the difficult Kansas City years, to Charlie Finley's three-peat champions and the Bash Brothers title in Oakland, to the Moneyball revolution and now a move to Las Vegas, the Athletics have repeatedly found new ways to matter. Nine World Series championships, a roster of legends, and two ideas that changed how baseball is run: that is the inheritance heading to the desert. The next chapter is still being written.

The LV Athletics is an independent, fan-run site and is not affiliated with Major League Baseball or the Athletics organization. Franchise facts drawn from public records including Baseball Reference, the official Athletics history, the National Baseball Hall of Fame, Baseball Almanac, the Society for American Baseball Research, and baseball reference archives.