On September 11, 1903 — A new National Agreement signed by the National Association of minor league clubs officially organizes professional baseball under one comprehensive set of rules.

 


Subscribe to This Day In Baseball

Get our latest Posts in your in box


Support This Day In Baseball on Patreon


Sources:
Baseball Reference September 11
National Pastime September 11
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game