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The Canadian territory of Yukon first required its residents to register their motor vehicles and display licence plates in 1914.
Passenger plates 1954 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 1954 (dated 1955) issue was the Yukon's first licence plate that complied with these standards.
References
Vehicle registration plates of Yukon Wikipedia(Text) CC BY-SA