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The Canadian province of New Brunswick first required its residents to register their motor vehicles in 1905. Registrants had to provide their own licence plates for display until 1911, when the province began to supply plates.
Passenger plates 1911 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 first New Brunswick licence plate that complied with these standards was issued seven years beforehand, in 1949 (dated 1950).
References
Vehicle registration plates of New Brunswick Wikipedia(Text) CC BY-SA