U.S. system or Imperial?

Do United States have its own measurement system (U.S. System) or is it Imperial? Imperial system was used in many countries including Great Britain before they switched to metric.

The question arise when we got a complain from Alana from Canada. She insisted the name "U.S. System" was wrong and makes of project look unprofessional. The question was not clear for me, so I went to check Wikipedia. I found the following there:

The Imperial units or the Imperial system is a collection of English units, first defined in the Weights and Measures Act of 1824, later refined (until 1959) and reduced. The units were introduced in the United Kingdom and its colonies, including Commonwealth countries (though most Commonwealth countries are now fully metricated), but excluding the then already independent United States. Systems of Imperial units are sometimes referred to as foot-pound-second, after the base units of length, mass and time.
The distinction between this imperial system and the U.S. customary units (also called standard units there) or older British/English units/systems and newer additions is often not drawn precisely. Most length units are shared among the Imperial and U.S. systems, albeit partially and temporally defined slightly differently.

So in fact it looks like the U.S. System is not quite equal to Imperial. The differences though are not always visible.

We decided to change the title to "British (Imperial) And U.S. System" to show both possible names. Hope it will make it more clear.

Thank you for your feedback, Alana.