1968 – Montreal officially becomes a member of the National League when new owner Charles Bronfman meets all of the expansion club’s outstanding financial obligations.

On August 14, 1968 — 1968 – Montreal officially becomes a member of the National League when new owner Charles Bronfman meets all of the expansion club’s outstanding financial obligations.

Source:
Baseball Reference August 14
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game