On January 28, 1901, professional baseball’s American League is founded in Milwaukee, reconstituting itself from a minor-league entity to a major-league one. The league plans for a 140-game schedule, 14-man rosters and a players’ union. Franchises are in Baltimore (Orioles), Boston (Americans), Chicago (White Stockings), Cleveland (Blues), Detroit (Tigers), Milwaukee (Brewers), Philadelphia (Athletics) and Washington (Senators).
The American League's formation came shortly after professional baseball’s other major league, the National League, contracted from 12 to eight teams. Formed in 1876, the NL had been professional baseball’s most stable league for decades.