A league is born, the Tigers finally integrate and another record pay day for Big Daddy. From Baseball-Reference.com:

1901 – The American League formally organizes as a major league, having been a top minor league in 1900: the Baltimore Orioles, Philadelphia Athletics and Boston Americans are admitted to join the Washington Nationals, Cleveland Blues, Detroit Tigers, Milwaukee Brewers, and Chicago White Sox. Three of the original clubs – Indianapolis, Minneapolis, and Buffalo – are dropped. League power aggregates in Ban Johnson as trustee for all ballpark leases and majority stockholdings, and with authority to buy out refractory franchises. Player limit is 14 per team, and the schedule will be 140 games. American League contracts give the Players Protective Association what it asked for, with five-year limits on the rights to player services.

1958 – The San Francisco Giants trade infielders Gail Harris and Ozzie Virgil to the Detroit Tigers for outfielder Jim Finigan and $25,000. Virgil becomes the first black player in a Tigers uniform.

1992Detroit Tigers first baseman Cecil Fielder avoids salary arbitration by agreeing to a $4.5 million contract, for the largest single-season deal in major league history.