2013 Event The Organization on the Prohibition of Chemical Weapons reports it has completed the inspection of 21 out of 23 chemical weapons sites across Syria, resulting in the destruction of over 1,000 metric tons of toxic agents and munitions 1975 Event Congress passes Metric Conversion Act 1938 Event AAU's decides to continue linear measuring system over metric 1866 Event Metric system becomes a legal measurement system in U.S. 1809 Event Dutch King Louis Napoleon accepts metric system 1799 Event Metric system established in France 1793 Event France becomes 1st country to use the metric system
