because they not want to
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The United States continues to use the English system of measurement due to historical precedent, inertia, and the costs associated with transitioning to the metric system. Some industries and sectors have already adopted the metric system, but a nationwide shift has not occurred.
The US measurement system is based on the English system, or imperial units, though England has now long since converted to SI.
The United States is one of few countries in the world that still uses the Imperial and/or US customary measurement system in which distance is measured in feet and inches, weight is measured in pounds and ounces, area is measured in acres, volume is measured in gallons. The United States, for whatever reason, has opted to keep this system of measurement, even though pretty much the rest of the world has adopted the metric system.
As I remember from grade school back in the 1960's I believe it was called: "Units and Standards" We refer to the U.S. measurement system today as the "Standard Measurement," "US Standard," "English Units," "US Customary Units," and "Imperial Units."
Tradition.
The English system and the metric system.