The US Congress’s Metric Conversion Act, passed in 1975, declared that “the metric system is the preferred system of weights and measures for US trade and commerce”

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The US Congress’s Metric Conversion Act, passed in 1975, declared that “the metric system is the preferred system of weights and measures for US trade and commerce” and established the United States Metric Board. President Ronald Reagan however abolished the Metric Board in 1982, ensuring continued use of imperial measurements in the USA.