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I think the Federal government already uses the metric system, but states have a choice. For instance, food regulation and labels are federal laws. Hence, grams, liters, calories, etc... Gasoline inspection done on state level, as is highway control. U.S. army, 5.56 mm round, 120 mm shells, 6 clicks to target, etc... Medication (federal controlled) measured in metric. 200 mg pills, 10 ccs fluid, one liter of plasma.
I do remember as a small child seeing kph signs on the highway in Massachusetts.
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