Tradition.
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The US measurement system is based on the English system, or imperial units, though England has now long since converted to SI.
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."
The United States is the country where the metric system is not the main system of measurement. The US primarily uses the Imperial system for measurements such as distance, weight, and volume.
No, Foot belongs to the Imperial and US customary units (according to Wikipedia)
The English system and the metric system.