On November 22, 1960 — 1960 – The American League proposes that both leagues expand to nine teams in 1961 and begin interleague play. There will be expansion in the American League in 1961, but interleague play will not arrive until 1997.

 


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Sources:

SABR Games Project
SABR Games Project
Hall of Fame
National Pastime November 22
Replay The Game
Retro Sheet