On ,December 10 1940 — In Chicago, a curious rule that was designed to “break up the Yankees” is continued by the American League, a rule which prohibits the team winning the championship from trading with any other club. The rule was voted in at the December, 1939 meetings by the seven other AL owners after the New York Yankees won four straight World Series. The major and minor leagues agree that players taken into the military will not count against roster limits.

 


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Sources:

Baseball Reference December 10

SABR Games Project

National Pastime December 10

Hall of Fame

Replay The Game

Retro Sheet