1884 – The Altoona Mountain City club is admitted to the Union Association as its seventh club, leaving Lancaster as the only franchise in the Inter-State League.

On February 20, 1884 — 1884 – The Altoona Mountain City club is admitted to the Union Association as its seventh club, leaving Lancaster as the only franchise in the Inter-State League.

Source:
Baseball Reference February 20
SABR Games Project
National Pastime February 20
Hall of Fame
Replay The Game
Retro Sheet

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