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usma.org
ep7rJ
TIL that in 1866 the US Congress passed legislation that legally protected use of the metric system in commerce.
7r6RX
TIL that the US uses customary units of measurement that, prior to 1959, were slightly bigger than the imperial system units. The Mendenhall Order established a set conversion rate between the US and metric systems, causing discrepancies with the imperial system over time.