Pushes up glasses. Well, actually, the United States of America has never used Imperial Units. We have used US Customary Units which share some of the more co

Pushes up glasses. Well, actually, the United States of America has never used Imperial Units. We have used US Customary Units which share some of the more common names. But the definitions and sizes are not the same, nor are all the names. Also, since 1893 US Customary Units have been defined in terms of SI units. https://en.m.wikipedia.org/wiki/Mendenhall_Order https://en.m.wikipedia.org/wiki/Mendenhall_Order https://en.m.wikipedia.org/wiki/Metric_Act_of_1866 https://en.m.wikipedia.org/wiki/Metric_Act_of_1866 https://en.m.wikipedia.org/wiki/Imperial_units https://en.m.wikipedia.org/wiki/Imperial_units