The
Metric Act of 1866 declared the metric system to be "lawful throughout the United States of America" and in all business dealings and court proceedings, in essence allowing metric units to be used in an official capacity throughout America. At an international commercial congress, the Treaty of the Meter, also known as the
Metre Convention (
Convention du Mètre) of 1875, was signed by 17 countries, including the US, making the metric system the international system of weights and measures. Note that this was a meeting of international states to facilitate commerce. This treaty, then, falls under the overview of the
United States Department of State, which has devolved oversight to the
United States Department of Commerce. The
Mendenhall Order of 1893 scrapped the previously used standards and definitions for the yard, pound, gallon, and bushel. It adopted the standards of the metric system and redefined the yard, pound, gallon, and bushel in terms of metric units. The
Metric Conversion Act of 1975 started a voluntary metrication process in the US and, as amended by the
Omnibus Foreign Trade and Competitiveness Act of 1988, declared the metric system to be "the preferred system of weights and measures for United States trade and commerce". ==Mission==