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Don't forget that although they use imperial measurement in the U.S., those units are based on METRIC standards. The U.S. holds one of few copies of the universal standard metre and kilogram that are kept in Paris and their inch, pound and all derivative units are measured against those.
While it's true they signed up the metric treaty, I think recently the way it's done is different as the physical weight standards have changed slightly over the years and they now do it using the atomic weight or something fancy like that.
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