In 1875, the U.S. signed the "Treaty of the Meter," establishing the International Bureau of Weights and Measures, of which the U.S. is a member.
Congress passed the "Metric Conversion Act of 1975" to transition us to a worldwide standard of measures, and in 1988 passed the "Omnibus Trade and Competitiveness Act," which designates metric as "the preferred system of weights and measures for United States trade and commerce."
It is long past time to complete the BEGINNING of our conversion. The Department of Education should mandate the instruction of metric in schools. The Department of Transportation must mandate metric in distance and speed limit signs on interstate highways.
Adopting a worldwide standard will facilitate international trade and commerce, and aid our economy.