Overview
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, the team became the Oakland Athletics, their current identity and location.
The beginning
The Western League was renamed the American League in 1900 by league president Bancroft (Ban) Johnson, and declared itself the second major league in 1901. Johnson created new franchises in the east and eliminated some franchises in the west. Philadelphia was given a new franchise to compete with the National League's Philadelphia Phillies.
Former catcher Connie Mack was recruited to manage the club. Mack in turn persuaded Phillies minority owner Ben Shibe as well as others to invest in the team, which would be called the Philadelphia Athletics, a name taken from the Athletic Base Ball Club of Philadelphia, which had been a founding member of the NL in 1876 but had folded after only one season. Mack himself bought a 25% interest, while the remaining 25% was sold to Philadelphia sportswriters Sam Jones and Frank Hough.
From Wikipedia (CC BY-SA 4.0).