The American Kilogram — Veritasium The US signed the metre convention and bases all customary units on SI standards. As an aside, the Utah constitution from 1895 required the metric system to be taught in schools. This requirement was repealed in 1987. ¯ Facebook Prev Article Next Article Discover Checkout these cool gadgets... Related Posts How Long Is One Second, Really? Diamonds Aren’t Forever – Chemistry: A Volatile History What If You Transplanted Your Head to a New Body? Discover – Baths and Quarks Its Official -Water On Mars! Supersymmetric Particle Found?