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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.
The U.S. Customary System of measurement derives from the British Imperial System of measurement. The British Imperial System has been superseded by the metric system and is no longer used in an official capacity. According to the CIA World Factbook, the United States, Burma and Liberia are the only nations that have not adopted the metric system as the official system of measurement.