1915 – The Red Sox clinch the American League pennant as St. Louis beats Detroit, giving Boston a 2 1/2-game margin. The World Series is now set for another Boston-Philadelphia matchup, but with the leagues reversed.

This Day In Baseball

On September 30, 1915 — 1915 – The Red Sox clinch the American League pennant as St. Louis beats Detroit, giving Boston a 2 1/2-game margin. The World Series is now set for another Boston-Philadelphia matchup, but with the leagues reversed.

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Sources:
Baseball Reference September 30
National Pastime September 29
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game