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The U.S. state of Minnesota first required its residents to register their motor vehicles and display license plates in 1909.
Passenger plates 1909 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 license 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 first Minnesota license plate that complied with these standards.
Since 1989, Minnesota law has required license plates to be replaced every seven years, due to deterioration of the reflective material.
References
Vehicle registration plates of Minnesota Wikipedia(Text) CC BY-SA