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The Canadian province of Nova Scotia first required its residents to register their motor vehicles and display licence plates in 1918.
Passenger baseplates 1918 to present
In 1956, the U.S. states and Canadian provinces came to an agreement with the Automobile Manufacturers Association that fixed the size for licence plates for vehicles, except those for motorcycles, at six inches in height by twelve inches in width, with standardized mounting holes. The 1955 (dated 1956) issue was the province's first licence plate that complied with these standards.
References
Vehicle registration plates of Nova Scotia Wikipedia(Text) CC BY-SA