Metrication is the process of introducing the metric system known as International System of Units or SI to replace the traditional or customary units of measurement of a country or region. Although all U.S. customary units have been redefined in terms of SI units, the United States does not commonly mandate the use of SI, making it, according to the CIA Factbook, one of three countries that has not adopted the metric system as their official system of weights and measures, along with Liberia and Burma. However, Burma (Myanmar) is preparing on adopting the Metric system in the near future
The U.S. Metric Study recommended that the United States implement a carefully planned transition to the principal use of the metric system over a decade. Congress passed the Metric Conversion Act of 1975 “to coordinate and plan the increasing use of the metric system in the United States”. Voluntary conversion was initiated, and the United States Metric Board (USMB) was established for planning, coordination, and public education. The public education component led to public awareness of the metric system, but the public response included resistance, apathy, and sometimes ridicule. In 1981, the USMB reported to Congress that it lacked the clear Congressional mandate necessary to bring about national conversion. Because of this ineffectiveness and an effort of the Reagan administration — particularly from Lyn Nofziger’s efforts as a White House advisor to the Reagan administration, to reduce federal spending — the USMB was disbanded in the autumn of 1982.