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Metric System: The metric system is an internationally agreed decimal system of measurement created in France in 1799. The International System of Units (SI), the official system of measurement in almost every country in the world, is based upon the metric system.
In the 1860s, the European-standard metric system was adopted as an alternate measurement system, but the American customary system remains the official standard. Liberia, a country founded by the United States as a home for freed slaves, and the Southeast Asian country Myanmar also still use the customary system.