|The Philadelphia Athletics were owned and managed by Connie Mack for fifty years 1901-1951. The Athletics were baseballs most dominant team from 1901-1915, winning 6 of the first 14 pennants in the American League's history.
After winning 4 pennants in 5 years, Mack lost some of his top stars to the new Federal League and sold off the others. Mack's Athletics stayed in last place for seven years. He purchased Lefty Grove from the Federal League, acquired Jimmy Foxx, Max Bishop, Rube Walberg and others and won the World Series in 1929 and 1930, plus in 1931 his Athletics took the pennant but were beaten by the St. Louis Cardinals in seven games.
Four years after Connie Mack retired the A's were sold and moved to Kansas City. baseballhistorian.com archives WS