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USDA
https://www.ams.usda.gov/grades-standards/beef/shields-and-marbling-picturesThe standard appears to be no more than a visual grading.
There appears to be no restriction upon the breed of cow/bull nor what they are fed nor how they are raised.
I'm not sure I understand this, if I choose to buy USDA certified meat, I don't have to be part of the USA to know that it's been checked and certified to USDA standards.