The National League votes to expand to 10 clubs if the planned Continental League does not join Organized Baseball. The new NL clubs would invade CL territories.

July 18, 1960 This Day In Baseball

On July 18, 1960 — The National League votes to expand to 10 clubs if the planned Continental League does not join Organized Baseball. The new NL clubs would invade CL territories.

Source:
Baseball Reference July 18

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