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what are the basic units of measurement in the metric system
There is only one unit of measurement for each type of quantity measured. The three most common base units in the metric system are the meter, gram, and liter.
How did the basic units of measurement in the metric system come about
In 1790, the French National Assembly commissioned the Academy of Science to design a simple decimal-based system of units; the system they devised is known as the metric system.
Does the U.S. use the the metric system devised by the Academy of science
In 1960, the metric system was officially named the Système International d'Unités, and is now used in nearly every country in the world except the United States.

Question: What system is used in the U.S.
Self-contained rewrite: What metric system is used in the U.S. for measurements